<P> The most popular religion in the U.S. is Christianity, comprising the majority of the population (70.6% of adults in 2014). According to the Association of Statisticians of American Religious Bodies newsletter published March 2017, based on data from 2010, Christians were the largest religious population in all 3,143 counties in the country . Roughly 46.5% of Americans are Protestants, 20.8% are Catholics, 1.6% are Mormons (the name commonly used to refer to members of The Church of Jesus Christ of Latter - day Saints), and 1.7% have affiliations with various other Christian denominations . Christianity was introduced during the period of European colonization . </P> <P> According to a 2012 review by the National Council of Churches, the five largest denominations are: </P> <Ul> <Li> The Catholic Church, 68,202,492 members </Li> <Li> The Southern Baptist Convention, 16,136,044 members </Li> <Li> The United Methodist Church, 7,679,850 members </Li> <Li> The Church of Jesus Christ of Latter - day Saints, 6,157,238 members </Li> <Li> The Church of God in Christ, 5,499,875 members </Li> </Ul> <Li> The Catholic Church, 68,202,492 members </Li>

What is the largest religious denomination in the united states