Three in 10 U.S. adults attend religious services regularly, led by Mormons at 67%
As Americans observe Ramadan and prepare to celebrate Easter and Passover, the percentage of adults who report regularly attending religious services remains low. Three in 10 Americans say they attend religious services every week (21%) or almost every week (9%), while 11% report attending about once a month and 56% seldom (25%) or never (31%) attend.
Among major U.S. religious groups, members of The Church of Jesus Christ of Latter-day Saints, also widely known as the Mormon Church, are the most observant, with two-thirds attending church weekly or nearly weekly. Protestants (including nondenominational Christians) rank second, with 44% attending services regularly, followed by Muslims (38%) and Catholics (33%).
Majorities of Jewish, Orthodox, Buddhist and Hindu Americans say they seldom or never attend religious services.
I think the flaw is that “attendance” is self reported. Mormons know they are supposed to attend, and there’s no harm is saying that they do to a pollster. There’s no way for the pollster to validate that.