Religion by the Numbers
The world is becoming less religious. The data is clear, the trend is accelerating, and no country has reversed it once it begins.
Global Religious Decline
The share of the world’s population identifying as non-religious has grown steadily over the past quarter century. What was once a fringe position is becoming mainstream.
% of global population identifying as non-religious
Sources: Pew Research Center, WIN/Gallup International Global Index of Religiosity and Atheism
The Rise of “Nones”
In the United States, the religiously unaffiliated — those who describe their religion as “nothing in particular,” agnostic, or atheist — have quadrupled in three decades. Meanwhile, the Christian share has fallen steadily.
Religiously unaffiliated (“Nones”)
Identifying as Christian
Sources: ARIS 1990, Pew Research Center Religious Landscape Studies, Gallup
The Generational Divide
Each successive generation is less religious than the last. Among Gen Z, the non-religious now outnumber Christians. This is not a phase — it is a structural shift.
Sources: Pew Research Center, PRRI Census of American Religion
The Most Secular Nations
Secularization is not an American phenomenon. Across the developed world, large shares of the population have moved away from religious identification entirely.
% of population identifying as non-religious
Sources: WIN/Gallup International, Eurobarometer, national census data
What’s Driving the Shift?
Education.Higher education is the single strongest predictor of non-religious identification. Exposure to comparative religion, philosophy, and the scientific method gives people frameworks for evaluating religious claims — and many find those claims wanting.
The internet.For the first time in human history, a teenager in a devout household can encounter counter-arguments to their family’s beliefs without leaving the room. The internet broke the information monopoly that religious communities once held over their members.
Urbanization. Cities are less religious than rural areas, everywhere in the world. Urban life exposes people to diversity of belief, reduces social pressure to conform, and provides secular community alternatives.
Social liberalization.As societies become more accepting of LGBTQ rights, gender equality, and reproductive autonomy, the gap between progressive social values and conservative religious doctrine widens. Many leave rather than reconcile the two.
None of these factors alone explains the shift. But together, they form a powerful current — one that shows no sign of reversing.
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Atheism
What atheism actually is, what it isn't, and why it matters.
Secular humanism
A positive worldview grounded in reason, ethics, and human flourishing.
Deconversion
How and why people leave religion behind — the process, the cost, and the freedom.
Philosophy
The intellectual traditions that offer meaning without mythology.