Why Belief Fades as Knowledge Grows

Here’s a pattern researchers keep finding: in country after country, as education, security, and prosperity rise, religious commitment falls. It’s one of the best-documented trends in the study of religion. It’s also more complicated than it first looks, and we’ll be honest about that too.

What the Data Shows

Younger people are less religious almost everywhere. Pew Research analyzed surveys from more than 100 countries and found that adults under 40 pray less, attend services less, and rate religion as less important than their elders in dozens of countries. Where there’s a difference between generations, it points the same way in all but a tiny handful of places (Ghana and Georgia are the famous exceptions). That’s not one culture drifting. That’s a worldwide generational shift.

The most developed societies are the least religious. In Pew’s 15-country survey of Western Europe, only about 18% of adults attend church regularly, and rising shares describe themselves as atheist, agnostic, or nothing in particular. Most people who still call themselves Christian don’t practice. When Pew asked the unaffiliated why they left, the top answer wasn’t anger or tragedy. It was gradually drifting away.

The decline follows a predictable sequence. A 2025 study using Pew data from 111 countries describes a “secular transition” that unfolds across generations: first attendance drops, then religion stops feeling important, and finally people stop identifying with a religion at all. Many European countries have reached that last stage. Others are earlier in the same sequence.

Political scientists Pippa Norris and Ronald Inglehart, in their book Sacred and Secular, offered the leading explanation: existential security. Where life is dangerous and uncertain, where illness, poverty, and violence are daily threats, religion thrives. Where people feel safe, educated, and provided for, the demand for it quietly fades. That theory predicts exactly the map we see.

The Honest Complications

If we only told you the convenient half, we’d be doing what we criticize. So here’s the rest.

Do Societies Fall Apart Without Religion?

A fair worry. If religion is what holds morality together, the least religious countries should be struggling. Sociologist Phil Zuckerman spent over a year living in Denmark and Sweden studying exactly this question, and published the results in his book Society Without God. What he found: two of the least religious societies on Earth rank among the world’s best on safety, trust, honesty in government, education, and overall wellbeing. Nobody claims secularism caused all that. But it clearly didn’t prevent it, and that alone answers the fear that a society without strong religious belief must collapse into chaos.

We look at this question in depth in Does Religion Make Us Good?

What Would We Expect to See?

If one religion were true and its truth were discoverable, we might expect belief to grow as people learn more, the way acceptance of germ theory or heliocentrism grew. Education would lead people toward the true faith, not away from every faith at once.

If instead religions are human institutions sustained by upbringing, community, and need, we’d expect belief to fade wherever those supports weaken: among the secure, the educated, the connected, and the free to leave. We’d expect the young to lead the change, region by region, in a repeating sequence. That second picture is the one the data keeps drawing.

None of this tells any individual what to believe. It just tells us something about where belief comes from. And it fits the same pattern as the map of who believes what: religion behaves like a thing cultures pass down, not a thing people independently discover.

Want to Go Deeper?