Children are growing up in societies experiencing significant changes in religious affiliation, religious practice and moral outlook.
A major 2025 study published in Nature Communications, drawing on data from more than 100 countries, identified a recurring pattern of religious decline across generations. The researchers found that religious participation often declines first, followed by a decline in the personal importance of religion and, eventually, a decline in religious affiliation.
Research from the Pew Research Center similarly found substantial movement away from religious affiliation in many countries. Between 2010 and 2020, the percentage of people affiliated with a religion fell by at least five percentage points in 35 countries. In many societies, younger generations are also less likely to identify with a religion than older generations.
These findings do not mean that religion is disappearing everywhere. Islam was the world’s fastest-growing major religion between 2010 and 2020, largely because of demographic factors, and religious switching into or out of Islam remains comparatively uncommon.
However, demographic growth and religious formation are not the same thing. A growing Muslim population does not automatically mean that every child is developing a strong, conscious and lasting relationship with Allah.