One-fifth of US adults – including one third of adults under age 30 – identify as religiously unaffiliated, the highest percentage ever recorded by the Pew Research Center’s Forum on Religious and Public Life.

The rapid growth of religiously unaffiliated adults, which rose from 15 percent to 20 percent in the past five years, indicates significant changes in the American religious landscape, say authors of the report, “ ‘Nones’ on the Rise,” released Tuesday.