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.
CORRECTION (Dec. 19, 2025): Two charts and some of the text in this chapter have been revised to correct the SHI median scores for the Asia-Pacific region, Europe, and the Middle East-North Africa region, and to revise Norway’s SHI category. The median scores changed by 0.1 point for each of these three regions. Refer to the errata […]