https://fivethirtyeight.com/features...ving-religion/

"Only 47 percent of American adults said they were members of a church, mosque or synagogue, according to recently released polling that was conducted by Gallup throughout last year. It marked the first time that a majority of Americans said they were not members of a church, mosque or synagogue since Gallup first started asking Americans about their religious membership in the 1930s. Indeed, Gallup’s finding was a kind of watershed moment in the long-chronicled shift of Americans away from organized religion.1"