Two-thirds of Americans (66%) identify as Christian, including 41% who identify as white Christians and 25% who identify as Christians of color. 28% of Americans are religiously unaffiliated, rising from 21% in 2013.

Source: 2025 PRRI Census of American Religion

Young women have steadily grown less likely to identify with a religious tradition since 2013, when 29% identified as religiously unaffiliated. In 2024, that figure grew to 40%, and in 2025, it increased to 43%. Most of that growth has resulted from a decline in religious affiliation among young women of color.

Source: 2025 PRRI Census of American Religion

Overall, younger Americans are less likely to identify as Christian than older Americans, a trend that has held true since 2013. Around three-fourths of Americans ages 65 and older (76%) and 50-64 (72%) identify as Christian, compared with 60% of Americans 30-49 and 54% of ages 18-29.

Source: 2025 PRRI Census of American Religion

The most religiously diverse county in the United States is Montgomery County, Maryland (0.886 on a scale of 0-1).

Source: 2023 PRRI Census of American Religion