<P> Christianity is the largest religion in the United States with the various Protestant Churches having the most adherents . In 2016 , Christians represent 73.7 % of the total population , 48.9 % identifying as Protestants , 23.0 % as Catholics , and 1.8 % as Mormons , and are followed by people having no religion with 18.2 % of the total population . Judaism is the second - largest religion in the U.S. , practised by 2.1 % of the population , followed by Islam with 0.8 % . Mississippi is the most religious state in the country , with 63 % of its adult population described as very religious , saying that religion is important to them and attending religious services almost every week , while New Hampshire , with only 20 % of its adult population described as very religious , is the least religious state . The most religious region of the United States is American Samoa ( 99.3 % religious ) . </P>
<P> Christianity is the largest religion in the United States with the various Protestant Churches having the most adherents . In 2016 , Christians represent 73.7 % of the total population , 48.9 % identifying as Protestants , 23.0 % as Catholics , and 1.8 % as Mormons , and are followed by people having no religion with 18.2 % of the total population . Judaism is the second - largest religion in the U.S. , practised by 2.1 % of the population , followed by Islam with 0.8 % . Mississippi is the most religious state in the country , with 63 % of its adult population described as very religious , saying that religion is important to them and attending religious services almost every week , while New Hampshire , with only 20 % of its adult population described as very religious , is the least religious state . The most religious region of the United States is American Samoa ( 99.3 % religious ) . </P>
what is the most popular religion in united states
what is the most popular religion in united states
Christianity
Christianity