According to a Pew Research Study, the share of Americans who identify as Christians shows signs of leveling off at slightly above six-in-ten. For the last five years, the Christian share of the adult population has hovered between 60% and 64%. The largest subgroups of Christians in the United States are Protestants – now 40% of U.S. adults – and Catholics, now 19%. People who identify with all other Christian groups (including the Greek and Russian Orthodox Churches, the Church of Jesus Christ of Latter-day Saints, Jehovah’s Witnesses and many others) total about 3% of U.S. adults.
Both Protestant and Catholic numbers are down significantly since 2007, though the Protestant share of the population has remained fairly level since 2019 and the Catholic share has been stable since 2014, with only small fluctuations in annual surveys. Religiously unaffiliated adults – those who identify as atheists, agnostics or as “nothing in particular” when asked about their religion – account for 29% of the population in the most recent survey. The size of the religiously unaffiliated population, or religious “nones,” has plateaued in recent years after a long period of sustained growth.
Additional findings from the survey, including rates of service attendance and daily prayer, can be found here on the Pew Research Center website.