- About three-quarters of Americans identify with a Christian faith
- 37% are highly religious; 33% not religious at all
- 48% of those who are highly religious approve of Trump
Protestants continue to make up the largest religious group in America, totaling 49% of U.S. adults interviewed as part of Gallup’s Daily tracking in 2017. Catholics are the next-largest group, at 23% of the population, with Mormons accounting for about 2%. This means that about three-quarters of Americans, overall, identify with a Christian faith.
Another 6% of the population identifies with a non-Christian faith, including Judaism, Islam and others, while 21% of Americans do not have a formal religious identity. All of these groups are within a percentage point of where they were in 2016, suggesting that the shifts seen in previous years have stabilized, particularly the growth among those with no religious identity.