35% of U.S. adults no longer identify with the religion in which they were raised – that’s about 90 million people who have changed their religious identities.
In many places surveyed, 20% or more of all adults have left their childhood religious group. Christianity and Buddhism have had especially large losses.
Christians remain the largest religious group, and Muslims grew the fastest from 2010 to 2020. Read how the global share of Buddhists, Hindus, Jews and the religiously unaffiliated changed.
After years of decline, the U.S. Christian share has been relatively stable since 2019, while the rise in the share of religious “nones” has slowed – at least for now.