Atheists and agnostics know more about religion than most other religious groups, while those with no particular religion are among the least knowledgeable.
The religiously unaffiliated were harassed by governments, private groups or both in 23 countries in 2017, up from 14 the previous year.
Though the percentage of religiously "nones" in America has risen, the global share of religiously unaffiliated people is expected to fall in coming decades.
The 2016 presidential exit polling reveals little change in the political alignments of U.S. religious groups.
Here’s what we know about self-described atheists and their beliefs.
The 35% of Millennials who do not identify with a religion is double the share of unaffiliated Baby Boomers (17%) and more than three times the share of members of the Silent generation (11%).