Buddhism is the only major religion that declined in number globally between 2010 and 2020, mostly due to religious disaffiliation in East Asia and to low birth rates.
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.
In many places surveyed, 20% or more of all adults have left their childhood religious group. Christianity and Buddhism have had especially large losses.