Presented by Claude for Zia H Shah MD

Abstract

Across the Western world, the fastest-growing religious identity is no religion at all. Roughly 29% of American adults, 37% of people in England and Wales, 35% of Canadians and 39% of Australians now say they have none, and among adults under 30 the share rises to between 44% and 70% depending on the country. This essay examines the rise of agnosticism, atheism and the broader “nothing in particular” posture across the United States, Canada, Britain, continental Europe and Australasia, drawing on the 2023–24 Pew Religious Landscape Study, the 2021 UK, Canadian and Australian censuses, the European Social Survey and Pew’s 2025 cross-national study of religious switching. It argues that the exodus is driven less by argument than by non-transmission: cultural Christianity is simply not being passed from parents to children, and the religiously unaffiliated now retain their own children at rates (around 73%) that rival those of the churches. Christianity bears the heaviest losses, with Catholicism losing about twelve leavers for every convert among young Americans. Islam in the West is eroding more slowly but measurably: three-quarters of Americans raised Muslim remain so, compared with near-total retention in Muslim-majority countries, and a growing, often hidden population of “cultural” and ex-Muslims is emerging in the second generation. The essay weighs the counter-evidence, including a much-publicised British “Quiet Revival” that was later withdrawn, and finds no reliable sign of a youth-led return to faith. It closes with a thematic epilogue on what the quiet exodus means for meaning, community and the religious traditions themselves.

Introduction: the age of the “nones”

For most of recorded Western history, religious identity was inherited the way a surname was. A child born in Lyon was Catholic, a child born in Uppsala Lutheran, a child born in Ohio probably Methodist or Baptist, and the question of whether one believed was secondary to the fact that one belonged. That inheritance has broken down within living memory, and the break is sharpest among the young. The sociologist Stephen Bullivant, surveying 16- to 29-year-olds across 22 European countries, put it bluntly: cultural religious identities are no longer being passed on, and the new default setting is “no religion” (Christian Post).

The people who answer “none” to the religion question are not a single tribe. Pew’s 2023–24 Religious Landscape Study found that of the 29% of Americans who are unaffiliated, only 5% call themselves atheists and 6% agnostics; the largest group, 19%, say their religion is “nothing in particular” (America Magazine). This matters for how the trend is understood. The exodus from religion is less a march toward confident unbelief than a drift into indifference: a growing number of people for whom the question of God has simply stopped feeling urgent. Atheism and agnosticism in the strict sense are growing, but the far larger phenomenon is disaffiliation without replacement.

Three features distinguish the current moment from earlier waves of secularisation. First, it is generational rather than cyclical: each birth cohort is less religious than the one before, and cohorts do not become more religious as they age. Second, it has reached the two great missionary faiths, Christianity and Islam, though at very different speeds. Third, it is now self-sustaining. A child raised without religion in 2026 is about as likely to remain unaffiliated as a child raised Catholic is to remain Catholic. The nones have become a tradition of their own.

This essay proceeds in five movements: the data across countries; the particular trajectory of Christianity; the quieter but real erosion within Western Islam; the generational engine that drives both; and the causes, complications and consequences. It ends with an epilogue that steps back from the numbers to ask what the exodus means.

The data: a continent-wide, hemisphere-wide shift

Every large Western democracy that asks its citizens about religion now reports the same shape: a shrinking Christian majority or plurality, a rising bloc of “no religion”, and a steep age gradient in which the young are far less affiliated than the old.

United States. The 2023–24 Religious Landscape Study, with nearly 37,000 respondents, found 62% of adults identify as Christian and 29% as unaffiliated, the latter up from 16% in 2007 (TRT World). Among adults aged 18 to 29, fewer than half (45%) are Christian and 44% are unaffiliated (ICJS). The headline that the decline has “plateaued” is true in aggregate but conceals a generational ratchet, discussed below.

England and Wales. The 2021 census recorded Christians as a minority for the first time in fifteen centuries, with 46% Christian and 37% no religion. The age profile is stark: the median age of a self-described Christian rose from 45 in 2011 to 51 in 2021, while “no religion” was the most common answer among those in their twenties, peaking at 52% for 26- and 27-year-olds in England and 66% for 27-year-olds in Wales (ONS; Jersey Evening Post). Across the whole UK, 52% of adults aged 34 and under reported no religion against 33% Christian (Church Times).

Canada. The share reporting no religion more than doubled in two decades, from 16.5% in 2001 to 23.9% in 2011 and 34.6% in 2021, while Christians fell from 77.1% to 53.3% over the same period (Statistics Canada via CBC). British Columbia passed the halfway mark at 52.1%, and Victoria reached 63.4%.

Australia. “No religion” rose from 22.3% in 2011 to 30.1% in 2016 and 38.9% in 2021, and Christianity fell below half of the population for the first time, to 43.9% (Australian Bureau of Statistics). Among Australians aged 18 to 34, 46% report no religion. New Zealand crossed into an unaffiliated majority (51%) between 2010 and 2020, as did the Netherlands (54%) (Wild Hunt summarising Pew).

Continental Europe. The most detailed picture of the young comes from Stephen Bullivant’s analysis of the European Social Survey. In 12 of 22 countries, a majority of 16- to 29-year-olds had no religion; the Czech Republic led at 91%, with Estonia, Sweden and the Netherlands between 70% and 80% (Catholic League). Practice was thinner still: in the UK, France, Belgium, Spain and the Netherlands, between 56% and 60% of young adults said they never attend services and between 63% and 66% never pray (Young Muslim Digest). Poland (17% no religion) and Lithuania (25%) remained the exceptions, and even there weekly Mass attendance among young Lithuanian Catholics was only 5%.

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The chart shows a continent split along an old fault line. The Protestant north and the formerly communist Czech lands are now overwhelmingly post-religious among the young; the Catholic east holds on; the Catholic west (France, Ireland, Spain) is moving quickly toward the north. These figures are from 2014–16 and every subsequent national survey suggests they have risen since.

The global frame. Pew’s 2025 study of global religious change found that the unaffiliated grew from 23% to 24% of the world’s population between 2010 and 2020, becoming the third-largest “religious” category after Christians and Muslims, and that the growth was driven mainly by people raised Christian in Western countries shedding their identity (Pew Research Center). In North America alone the unaffiliated share rose 13 points to 30.2% (Connecticut Public/RNS). The West is secularising while much of the world is not; the two trends are happening at once.

Christianity: the great unravelling

Christianity is losing the West not through conversion to rival faiths but through quiet departure to nothing. Pew’s global analysis found that for every 100 adults raised Christian worldwide, 17 have left and only 5.5 have joined, a net loss of nearly 12 per 100, the largest of any major religion (LiCAS). The Church has sustained net losses of 20 percentage points or more of the total adult population in Spain, Sweden, the Netherlands, Germany, Canada, the United Kingdom, France, Australia and the United States (The Stream, summarising Pew).

The American case. In the United States, Christians fell from 78% of adults in 2007 to 62% in 2023–24, and the share who are white dropped from 70% to 61% of all Christians as Hispanic Christians grew to 18% (FingerLakes1). Among 18- to 24-year-olds, 26% are former Christians while only 5% are converts to Christianity (Pew, December 2025). The two largest Protestant bodies, the Southern Baptist Convention and the United Methodist Church, have both lost many members since 2007.

Catholicism bears the heaviest losses. Pew’s December 2025 analysis found that Catholics retain only 57% of those raised in the faith, far below Hindus (82%), Muslims (77%), Jews (76%) and Protestants (70%) (Arkansas Catholic). Thirteen percent of all American adults are former Catholics. Among the youngest adults, 12% have switched out of Catholicism and only 1% have switched in, a ratio of twelve leavers for every convert (Pew). Former Catholics who became “nones” most often say they stopped believing the Church’s teachings (52%), followed by clergy scandals (44%) and dissatisfaction with teachings on social and political issues (42%) (UCA News).

Mainline and evangelical trajectories. The mainline Protestant denominations (Episcopal, Presbyterian, Lutheran, Methodist, United Church of Christ) have been in demographic decline since the 1960s and now skew heavily toward the old; many individual congregations are projected to close between 2050 and 2070 (Baptist News Global). Evangelicalism held up longer, buoyed by higher fertility and stronger retention, but it too now loses the young, and the political fusion of evangelical identity with partisan conservatism has become a documented reason for departure, especially among young women. The Survey Center on American Life found a historic reversal: 54% of Gen Z leavers are women, overturning generations in which men led the exodus, with many citing the treatment of women and teachings on abortion and sexuality.

Europe’s established churches. The Church of England’s own figures show average Sunday attendance below 700,000 in a nation of 57 million, and the 2021 census found only 7% of young Britons identify as Anglican, fewer than the 10% who are Catholic and barely more than the 6% who are Muslim (Catholic League). In Ireland, once the most Catholic society in Europe, 39% of young adults now have no religion, and the abuse scandals, the 2015 marriage referendum and the 2018 abortion referendum marked the collapse of the Church’s social authority. The German churches lose hundreds of thousands of registered members each year as young adults formally de-register to avoid church tax. Scandinavia’s Lutheran state churches retain nominal membership through infant baptism but report single-digit weekly attendance.

Orthodoxy and the “trad” turn. Much has been written about young men converting to Eastern Orthodoxy or traditionalist Catholicism. The numbers do not support a movement. Among American 18- to 24-year-olds, 1% have converted into Orthodoxy and an equal 1% have left it (Pew). These conversions are real and often intense, and they generate disproportionate media attention precisely because they run against the tide. But they are rounding errors against the tens of millions drifting the other way.

The pattern across all branches is the same: a smaller, older, more committed remnant surrounded by a growing population of the formerly Christian. Bullivant’s prediction that mainstream churches will be “smaller, but the few people left will be highly committed” is already visible in attendance figures, where the share of regular attenders among self-identified Christians has risen even as the number of self-identified Christians has fallen.

Islam in the West: a quieter erosion

Islam is the great exception to global secularisation, and the West is the great exception to Islam’s exceptionalism. Worldwide, Pew estimates that 99% of people raised Muslim remain Muslim, a retention rate matched only by Hindus (LiCAS). Muslims were the fastest-growing religious group on earth between 2010 and 2020, adding 327 million people, more than every other religion combined, almost entirely through births rather than conversion (Catholic World Report). In Muslim-majority countries, leaving is rare, socially costly and in some places criminal.

In the West the picture changes. Of the 13 countries where Pew could measure Muslim switching, the United States had by far the lowest retention: roughly three-quarters of Americans raised Muslim still identify as Muslim, compared with figures that round to 100% in Bangladesh, Indonesia, India and Sri Lanka and 97% in Turkey (Pew Research Center). Of those who left, 13% of all adults raised Muslim now have no religion and 6% are Christian. Pew’s 2017 survey of American Muslims found the same thing: 24% of those raised Muslim had left, and 55% of the leavers identified with no religion at all (Pew Research Center). That rate of departure is almost identical to the 22% of Americans raised Christian who had left Christianity at the time. The asymmetry is in the arrivals: one-fifth of American Muslims are converts, mostly from Christianity, so the net effect of switching on Islam’s size in America is roughly a wash, where for Christianity it is a steep net loss.

Who leaves, and why. The reasons American ex-Muslims give are strikingly similar to those of ex-Christians. A quarter cite religion in general (disliking organised religion, not believing in God, not being religious); a fifth cite something specific to Islam, such as never connecting with the faith or disagreeing with its teachings; others cite a preference for another philosophy or simply growing up and becoming educated (Pew). Former Muslims are disproportionately Iranian-American (22% of leavers versus 8% of stayers), a legacy of the secular exodus after 1979. A survey of ex-Muslims by Ex-Muslims of North America found that only 22% knew another ex-Muslim before leaving, that two-thirds identify as liberal or progressive, and that most left after sustained study rather than on a whim (EXMNA).

Europe: contested evidence. The European picture is more complex than either secularists or Islamists claim. Qualitative research in Britain, the Netherlands, Germany and Sweden documents a growing population of people raised Muslim who no longer believe but remain, in Maria Vliek’s phrase, “between secularity and belonging”: culturally Muslim, often still fasting at Ramadan or avoiding pork, but privately agnostic or atheist (Routledge). Interviews with 80 ex-Muslims in Germany and Sweden found that leaving brought freedom but not safety; fear of family and community reaction keeps many silent (Routledge). This hidden quality is why survey counts almost certainly understate departure: an ex-Muslim who still says “Muslim” to a pollster, to a parent, or to a census form, is counted as retained.

At the same time, quantitative studies have repeatedly failed to find the straightforward generational decline that secularisation theory predicts. A Dutch government study found mosque attendance among Moroccan-Dutch rising from 9% to 33% between 1998 and 2011, with 61% of young Moroccan-Dutch praying five times daily, and concluded that second-generation Muslims were not becoming less religious (DutchNews). A 2026 analysis of the Children of Immigrants Longitudinal Survey in England, Germany, the Netherlands and Sweden found only partial support for religious decline among Muslim youth, mainly in prayer frequency, and found that perceived discrimination did not increase religiosity as the “reactive religiosity” hypothesis predicts (University of Amsterdam). Bullivant’s European data showed young Muslims holding at 6% in Britain and 10% in France while young Christians collapsed around them.

Why Islam resists, and where it does not. Several factors slow the erosion. Western Muslims are overwhelmingly first- or second-generation immigrants, and immigrant religiosity is a known protective factor; the faith is bound up with ethnicity, language and family in a way that English Anglicanism has not been for a century. Religious practice is embedded in daily life (prayer, diet, fasting, dress) rather than confined to a weekly service, which makes it harder to drift out of without noticing. Minority status itself sustains identity. And the social cost of open apostasy is higher than for any Christian denomination.

But the American data show what happens when those protections weaken. By the third generation, with intermarriage, geographic dispersal and full cultural fluency, Muslim retention falls toward the Christian norm. The US, with its older and more assimilated Muslim population (including large Iranian and South Asian professional communities), is probably a preview of where European Islam will be in two or three decades, not an anomaly. The trajectory is slower than Christianity’s, but the direction is the same, and it is the second generation, now reaching adulthood across Europe, that will decide the pace.

The generational engine

The single most important fact about Western secularisation is that it is a cohort phenomenon, not a period one. People are not losing their religion in middle age; they are failing to acquire it in childhood, and each new cohort arrives less religious than the last. Pew’s 2025 analysis is explicit that the long decline was driven largely by generational replacement: older cohorts who are highly religious die and are replaced by younger cohorts who are not, and within every cohort religiousness has also drifted gently downward with age (Pew Research Center). Pew’s landscape studies between 2007 and 2024 found no evidence that Americans grow more religious as they age (America Magazine).

The ladder. In the United States, using the Cooperative Election Study’s 2024 wave, the political scientist Ryan Burge put the unaffiliated share at roughly 24% of Baby Boomers, 31% of Generation X, 42% of Millennials and 46% of Generation Z (Catholic News Agency). The Silent Generation, which is 18% unaffiliated, is dying at hundreds of members a day and being replaced by a Gen Z that is more than twice as unaffiliated (Christianity Today). Pew’s own landscape studies show the same ladder in a different form: 74% of 18- to 24-year-olds identified with a religion in 2007, 63% in 2014, and 56% in 2023–24.

Why the plateau is temporary. Since about 2020 the overall share of nones in America has held near 29%, and this has been widely reported as the end of the trend. It is better understood as a pause between waves. The pool of nominal, culturally Christian adults who could become nones has largely been drained; nearly everyone who wanted to stop calling themselves Christian already has. The next rise will come not from conversion within cohorts but from the replacement of cohorts. As one analysis put it, if roughly 28% of adults are nones now and Gen Z is 43%, 25 points above the Boomers they are replacing, the overall share will inevitably rise; reversing it would require around 10 million Millennials and 18 million Gen Z adults to reaffiliate, and no dataset shows any sign of that (Legally Sociable). Burge’s summary is the cleanest: the rise has hit a plateau, that won’t last, and generational replacement means the nones will continue to rise (Baptist News Global).

Transmission has broken. The deepest mechanism is the failure of religious inheritance. Pew found that 85% of all religious switching happens before age 30, and that among adults under 30, only 55% still identify with their childhood religion while 35% have become unaffiliated (America Magazine). Religious upbringing is the strongest predictor of retention: children who prayed at night, said grace, read religious stories and attended services regularly are far more likely to stay. But the share of households doing those things is itself falling with each generation, so the engine feeds itself.

The nones now reproduce. For most of the twentieth century, children raised without religion often drifted into one as adults, and the unaffiliated were a leaky category. That has ended. Pew found that 73% of people raised as nones remain unaffiliated, and only 3% of all American adults have made the transition from no childhood religion to an adult religion (Christian Today). Among 18- to 24-year-olds, a quarter have become nones after a religious upbringing while only 5% have left the nones for a religion: six joiners for every leaver, the mirror image of Christianity’s ratio (Pew). The unaffiliated have become as “sticky” as any church, and the children of today’s nones are the first large Western generation raised with no religious memory at all.

The vanishing gender gap. For as long as surveys have existed, women have been more religious than men. Among the young, that is over. In Pew’s 2023–24 study, 57% of women aged 18 to 24 identified with a religion and 58% of men did, with no significant difference in belief in God or daily prayer, whereas in 2007 and 2014 young women were clearly more religious (Pew). The convergence is entirely a product of women leaving faster, not men returning. Young women’s departure, concentrated among those raised evangelical and Catholic, is tied in survey after survey to teachings on gender, sexuality and abortion, and it has a compounding effect because mothers have historically been the primary transmitters of faith to children.

Europe is a generation ahead. Everything described above happened in Britain and northern Europe two or three decades earlier. The 2021 census showed that the cohort aged 21 to 25 contained 800,000 fewer Christians than the same cohort had at ages 11 to 15 a decade before (The Tablet): the children ticked the box because their parents did, and un-ticked it the moment they filled in the form themselves. Bullivant’s finding that many young Europeans are baptised and then never darken the door of a church again describes the American future as much as the European present.

Causes: why the young are leaving

No single cause explains the exodus, and the people who have left do not themselves agree on why. But the surveys, the sociology and the interviews converge on a cluster of interacting forces.

1. Loss of belief, not loss of interest in the first instance. When Pew asked Americans who had left their childhood religion for no religion why they did so, the most common answer, given by 51%, was that they had stopped believing the religion’s teachings; 44% said religion was no longer important to them and 42% that they had gradually drifted away (Religion News Service via Hinduism Today). Among those who now identify as nones, 78% say they can be moral without religion, 64% question religious teachings, and about half distrust religious organisations (50%) and leaders (49%). The order matters: intellectual disbelief is the leading stated cause, with institutional distrust close behind.

2. Scandal and institutional collapse of trust. The Catholic abuse crisis is the clearest single blow. 44% of former Catholics who became nones cite clergy scandals as an important reason (UCA News), and the chronology of Irish, Australian, German and American disaffiliation tracks the revelation of abuse and its cover-up with uncomfortable precision. For Protestants, the equivalent wounds have been financial and sexual scandals among prominent pastors and the Southern Baptist abuse report of 2022. The damage is not only to the institution but to the plausibility of its moral authority, which is what a young person weighs when deciding whether its teachings on sex, gender or doubt deserve deference.

3. The politicisation of faith. In the United States, religion has sorted along party lines to an unprecedented degree. Pew’s adviser Penny Edgell notes that religious and political identity now align with whether people support traditional, patriarchal gender and family arrangements (America Magazine). Among adults raised in a religion, 73% of Republicans retain it against 56% of Democrats (UCA News). The fusion of white evangelicalism with partisan conservatism since the 1980s, and especially since 2016, has made “Christian” read as a political label to many young liberals and moderates, who leave the label rather than the politics. 38% of nones cite unhappiness with social and political teachings; 29% cite the treatment of women.

4. Science, pluralism and the ordinary secular default. The classic secularisation thesis, that modernity, education and scientific explanation erode religious plausibility, remains partially true but is often overstated. Most young nones did not reason their way out of theism; they simply never encountered a social world in which theism was assumed. Pew finds religious switching is far more common in countries with high human development scores, where a median of 18% of adults under 55 have changed religion (LiCAS). Prosperity, security, welfare states, long lifespans and low infant mortality remove the existential precariousness that religion has historically addressed. Pluralism does the rest: a child who grows up with Muslim, Hindu, atheist and Christian friends learns early that religion is one option among several, and options can be declined.

5. The internet and the end of the sheltered childhood. The generation that reached adulthood after 2010 is the first to have grown up with unlimited access to counter-arguments, ex-believer testimonies, biblical criticism, comparative religion and online communities of the unaffiliated. For Muslims especially, the internet has been decisive: anonymous ex-Muslim forums with tens of thousands of members allow questioning without the social cost that an open conversation would carry (The Telegraph via Telegraph India). Religious communities that once controlled the information environment of their young no longer can.

6. Individualism, authenticity and the moral self. The dominant ethic of the young West is that the self must be authentic and that belief should be chosen, not inherited. This cuts against every traditional religion, all of which transmit through inheritance and community. The sociologist Christian Smith, whose Millennial Zeitgeist Survey and 200 interviews with 18- to 54-year-olds inform his recent work, concludes that religion is culturally in more trouble than a plateau suggests, because the question of religion’s relevance to daily life has simply ceased to arise for most young adults (Lawyers, Guns & Money). People do not reject religion; they find it beside the point.

7. Family structure and non-transmission. Finally, and most mechanically, religion is transmitted through intact, religiously practising households, and there are fewer of those. Later marriage, lower fertility, higher divorce and cohabitation, two-earner households and geographic mobility all weaken the dense family-congregation-neighbourhood networks that once made belonging automatic. Pew’s data show that Protestant parents are far more likely than Catholic parents to take children to services (61% vs 47%), to talk with them about religion (38% vs 24%) and to describe their home as very religious (35% vs 20%), which is a large part of why Catholic retention is so much lower (UCA News). Where the practices stop, the faith stops within a generation.

These causes reinforce one another. Scandal lowers trust, lowered trust makes political alignment look like hypocrisy, hypocrisy pushes the young to seek authenticity elsewhere, the internet supplies the elsewhere, and the parents who left pass nothing on. The engine is now self-propelling.

Complications: what the headline numbers hide

The story is not as simple as “the young are becoming atheists”, and four complications deserve honest treatment.

Unaffiliated is not unbelieving. The religious nones are a coalition. Pew’s global report notes that 54% of unaffiliated American adults believe in God or a universal spirit and 69% believe humans have a soul (Pew Research Center). Among nones, 57% say they can be spiritual without religion. Strict atheists remain a small minority, 5% of Americans; agnostics another 6%. What is growing fastest is not the Dawkins-style confident unbeliever but the shrug: “nothing in particular”. This group retains vestigial beliefs, occasional prayer, interest in astrology, meditation, manifestation and other practices that would once have been called superstition and are now called wellness. Secularisation in the West is producing a population that is post-institutional more than post-religious, which is both a smaller loss for religion and a harder one to reverse, since there is no argument to win.

The plateau and the “revival” that wasn’t. Since 2020, headline American figures have been stable, and from 2024 a wave of reports claimed that Gen Z, and young men in particular, were returning to church. Pew examined these claims with its own surveys, the General Social Survey and the American Time Use Survey and found no clear evidence of a revival: today’s young adults are less religious than young adults were a decade ago, the youngest adults (born 2003 or later) are at most slightly more observant than those a few years older, a pattern that has appeared before and faded as cohorts left home, and the share of young adults attending services on a given Sunday was 11% in 2021 and 10% in 2024 (Pew Research Center). The Barna finding that Gen Z churchgoers attend more often than older generations is best read as a composition effect: the casual attenders have stopped, leaving a smaller and more devout core (Crosswalk).

The most dramatic revival claim came from Britain. In April 2025 the Bible Society published The Quiet Revival, a YouGov study reporting that monthly church attendance among 18- to 24-year-olds had leapt from 4% in 2018 to 16% in 2024, and among young men to 21%. It was reported worldwide and cited in American and Australian church circles as proof that the tide had turned. In March 2026 the Bible Society withdrew the report after YouGov admitted that its quality-control systems had failed during the 2024 survey, letting in fraudulent, duplicate and inattentive respondents, and that the sample could no longer be regarded as reliable (The Tablet). The British Social Attitudes survey, which had contradicted the report from the start, showed continued decline in attendance across all age groups (UnHerd). The episode is instructive in two ways: it shows how much appetite exists for good news about faith, and how little the robust data support it.

Young men, young women and the small counter-currents. Something is nevertheless happening at the margins. The gender convergence among the young means that, for the first time, young men are at least as likely as young women to be religious, and in some surveys slightly more likely to attend. Anecdotal and congregational reports of young male converts to Orthodoxy, traditional Catholicism and Reformed Protestantism are consistent and credible at the level of individual parishes even if they do not register nationally. Bible sales rose sharply in both Britain and America in 2024–25. These are real signals of a hunger for structure, transcendence and meaning among a subset of young men, and they coexist with, rather than contradict, the broader exodus.

Immigration as the churches’ lifeline. The one force demonstrably slowing Western secularisation is migration. One in five Catholics in Britain was born abroad; Hispanic Christians now make up 18% of American Christians; the growth of Pentecostal and African-led churches in London, Paris and Houston is almost entirely immigrant. Australia’s recent arrivals are more religious than the native-born, though close to 30% of them also report no religion (Insights). Immigration masks the decline among the native-born and delays the day when the churches’ age profile becomes fatal. It does not reverse the underlying trend, because the children of immigrants secularise at Western rates within one or two generations, as the American Muslim data show.

Taken together, these complications suggest a West that is not becoming atheist but becoming indifferent: a civilisation in which the religious are a committed minority, the irreligious a committed minority, and the large middle has stopped asking.

Consequences

For the institutions. The arithmetic of ageing congregations is unforgiving. A church whose median member is 51 and whose under-30 pipeline is a third the size of its over-60 cohort will halve within twenty-five years without any further defections. Across Western Europe, church buildings are being sold, merged or converted at a rate without precedent since the Reformation; dioceses are consolidating parishes; seminaries are closing. The Catholic Church faces a clergy shortage that already leaves many European and American parishes without a resident priest. For mosques the pressure is different and later: Western Muslim communities are young and growing, but their leadership is often imported, and the second generation’s quieter drift is a problem that most imams have not yet been trained to address.

For community and social capital. Religious congregations have been the West’s largest providers of weekly face-to-face community, charitable volunteering and cross-class mixing. Robert Putnam’s work showed that religious Americans volunteer, donate and join at markedly higher rates than their secular peers, and that this is a function of congregational networks rather than belief. No secular institution has emerged at comparable scale. The decline of religion therefore coincides with, and partly causes, the measured decline in civic participation, friendship networks and in-person association that has been documented across the West. The young who leave church rarely join anything in its place.

For mental health and meaning. The evidence here is contested and must be stated carefully. Religious participation correlates with lower rates of depression, substance misuse and suicide in many large studies, and the generational cohorts that have left religion are also the cohorts reporting the highest levels of anxiety and loneliness; one in five Australians aged 16 to 34 reported high or very high psychological distress in the 2021 census (Hit Network). But correlation is not cause, and the mechanisms, if any, run through community, routine and purpose rather than belief in propositions. What can be said with confidence is that religion once answered three questions for most people (how should I live, where do I belong, what does my suffering mean) and that the young Western nones are the first mass population to answer all three alone.

For public life. The political consequences are visible already. In the United States, the sorting of the religious into one party and the unaffiliated into the other makes religion itself a partisan marker and makes the churches’ public statements sound like campaign literature. In Britain and Ireland, the formal privileges of established or historically dominant churches (bishops in the House of Lords, church control of state-funded schools) sit increasingly awkwardly with a population that is majority non-religious under 40. For Western Islam the consequences are the inverse: as Christian identity fades, Muslims become the most visibly religious group in secular societies, which exposes them to both the resentment of secularists and the attentions of those who would make Islam the marker of an un-Western “other”. Ex-Muslims, meanwhile, are caught between a community that may ostracise them and a secular majority that does not know they exist.

For the faiths themselves. The deepest consequence may be theological. Christianity has always claimed that it is not a tribal inheritance but a universal truth freely embraced; a Church of committed converts and children of converts, without the ballast of cultural Christians, is in one sense closer to its own self-description than the Christendom that is disappearing. Islam faces a harder version of the same test, because its traditional jurisprudence treats exit as a crime, and Western Muslim thinkers are now being forced to articulate, in public and for their own children, whether faith that cannot be left can be freely held. Both religions will survive the exodus. Whether they survive it as living traditions or as heritage institutions will depend on what they say to the generation that has already stopped listening.

Epilogue: the empty pew and the open question

There is an old image, from Matthew Arnold’s Dover Beach, of the Sea of Faith that once lay “round earth’s shore” and now retreats with a “melancholy, long, withdrawing roar”. Arnold wrote it in 1867. The tide he heard going out has been going out for a hundred and sixty years, and the shore it leaves behind is not the one he feared. He imagined a world of “neither joy, nor love, nor light”. What has arrived instead is a world of young people who are, on the whole, kind, tolerant, anxious, busy, and uninterested in the question he thought they would mourn.

That is the first theme of this essay’s data: the exodus is not a rebellion. The Enlightenment and the New Atheists imagined that religion would fall to argument, and a few people do leave that way; Pew’s leavers most often say they stopped believing the teachings. But most of the young do not reject religion so much as fail to inherit it. They were given no vocabulary for the sacred, no habit of prayer, no community in which belief was the water they swam in. Faith was not refuted in their lives; it was never proposed. The empty pew is less a verdict than an absence.

The second theme is that the two faiths at the centre of this story are facing the same test from opposite directions. Christianity in the West is discovering what it is when it is no longer the culture: a minority with a message, surrounded by people who have heard of it and are not curious. Western Islam is discovering what it is when its children are the culture: a faith of immigrants whose grandchildren are natives, with native freedoms and native doubts. The Christian churches have spent a generation learning to live without the state, the schools and the social default; the mosques are only beginning to learn to live without the assumption that the next generation will stay. Each might learn something from the other. Christianity shows what happens when a faith relies on inheritance and the inheritance fails; Islam shows, for now, what embedded daily practice and dense community can do to slow the drift. Neither has yet shown that it can win back the young it has lost.

The third theme is that nature abhors a vacuum, and the vacuum is not staying empty. The nones are not Arnold’s bleak materialists; they believe in souls, in a universal spirit, in meaning, in moral obligation, in the possibility of something more. They practise meditation, read horoscopes, build rituals around fitness and food, join online communities with creeds and heresies and excommunications of their own. The religious instinct, if that is what it is, has not vanished; it has been privatised, deinstitutionalised and scattered. Whether a civilisation can carry its deepest questions in that form, without the shared stories, buildings, calendars and disciplines that religions provided, is the real open question of the twenty-first-century West, and nobody knows the answer, because it has never been tried at scale before.

A physician sees something of this at the bedside. Patients in extremity reach for whatever they have: a prayer their grandmother taught them, a half-remembered psalm, a sense that someone is listening. The young nones will reach, too, when their turn comes, and the question is what will be there when they do. The traditions that survive will not be the ones that lament the tide, nor the ones that pretend it has turned on the strength of a faulty poll. They will be the ones that have learned to speak to people who were never taught the language, and who are, despite everything, still listening for a word.

The sea does go out. But Arnold’s beach was tidal, and tides have two directions. The data in this essay describe the ebb with some precision. They say nothing about whether, or when, or in what form, the water comes back. That is not a failure of the data. It is the limit of what counting can tell us about the thing being counted.

Sources

Primary surveys and reports

• Pew Research Center, Decline of Christianity in the U.S. Has Slowed, May Have Leveled Off (2023–24 Religious Landscape Study, February 2025)
• Pew Research Center, Religion Holds Steady in America: no clear evidence of a religious revival among young adults (December 2025)
• Pew Research Center, Why Do Some Americans Leave Their Religion While Others Stay? (December 2025)
• Pew Research Center, Religious switching into and out of Islam, in Around the World, Many People Are Leaving Their Childhood Religions (March 2025)
• Pew Research Center, How the Global Religious Landscape Changed From 2010 to 2020 and Religiously unaffiliated population change (June 2025)
• Pew Research Center, The share of Americans who leave Islam is offset by those who become Muslim (2018, on the 2017 survey of U.S. Muslims)
• Office for National Statistics, Religion by age and sex, England and Wales: Census 2021
• Statistics Canada, 2021 Census of Population, religion release, reported by CBC News
• Australian Bureau of Statistics, 2021 Census shows changes in Australia’s religious diversity
• Stephen Bullivant, Europe’s Young Adults and Religion (St Mary’s University / Institut Catholique de Paris, 2018), reported by Christian Post and Catholic League
• Ryan Burge, analysis of the 2024 Cooperative Election Study, reported by Catholic News Agency and Baptist Press

On Islam in the West

• Maria Vliek, Former Muslims in Europe: Between Secularity and Belonging (Routledge, 2021)
• Weronika Lenartowicz, Leaving Islam, Ex-Muslims and Zemiology (Routledge, 2024)
• Ex-Muslims of North America, 10 Myths about Ex-Muslims
• Secular socialization vs. religious reactivity, Ethnic and Racial Studies 49(9), 2026
• SCP (Netherlands Institute for Social Research) findings on Dutch Muslim religiosity, reported by DutchNews

On the “Quiet Revival” and the revival debate

• Bible Society pulls flawed ‘Quiet Revival’ report, The Tablet, 26 March 2026
• How real is the Christian revival?, UnHerd, March 2026
• Gen Z and the Future of Church Attendance, Crosswalk, September 2025

Secondary reporting used for specific figures

• America Magazine, ICJS, FingerLakes1, TRT World on the 2023–24 RLS
• UCA News, Arkansas Catholic, America Magazine, Christian Today, Hinduism Today/RNS on the December 2025 Pew switching report
• LiCAS, Catholic World Report, Wild Hunt, Connecticut Public/RNS, The Stream on Pew’s global reports
• Church Times, The Tablet, Jersey Evening Post on the UK census
• Christianity Today, Baptist News Global, Legally Sociable, Lawyers, Guns & Money on generational replacement
• Insights (Uniting Church) and Hit Network on Australia
• Telegraph India on ex-Muslim online networks

Note on figures: percentages are quoted as published by each source; where sources round differently (for example 28% vs 29% unaffiliated in the United States), the discrepancy reflects different surveys and years, not an error. Bullivant’s European figures are from 2014–16 and are the most recent comparable cross-national data on 16- to 29-year-olds; national surveys since then point to further decline.