A parishioner sits in a pew at St. Paul's Methodist Church in Denver in 2016. (John Leyba/The Denver Post/Getty Images)

About Three-in-Ten U.S. Adults Are Now Religiously Unaffiliated

Self-identified Christians make up 63% of the U.S. population in 2021, down from 75% a decade ago.

Pew Research Center's Religion & Public Life Project