One-quarter of all adult Americans under age 30 (25%) are not affiliated with any particular religion, which is more than three times the number of unaffiliated adults ages 70 and older (8%).
Only about one-in-eight Americans describe themselves as atheist, agnostic or unaffiliated with a religious tradition, though the number has risen from the 8% who said so in 1987.
That’s the percentage of Republicans expressing strong religious commitment in the latest Pew Values survey, a higher number than at any time in the past 20 years.