what is the most practiced religion in the united states?
Christianity
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 The largest denominations by number of adherents in 2010 were the Roman Catholic Church ( 4 @,@ 673 @,@ 500 ) ; the Southern Baptist Convention ( 3 @,@ 721 @,@ 318 ) ; the United Methodist Church with ( 1 @,@ 035 @,@ 168 ) ; and Islam ( 421 @,@ 972 ) . 

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 A study conducted by the Pew Research Center found that about 16 % of the world 's people , the third largest group after Christianity and Islam , have no religious affiliation . According to a 2012 report by the Pew Research Center , agnostics made up 3 @.@ 3 % of the US adult population . In the U.S. Religious Landscape Survey , conducted by the Pew Research Center , 55 % of agnostic respondents expressed " a belief in God or a universal spirit " , whereas 41 % stated that they thought that they felt a tension " being non @-@ religious in a society where most people are religious " . 

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 As with other Western countries , the U.S. is becoming less religious . Irreligion is growing rapidly among Americans under 30 . Polls show that overall American confidence in organized religion has been declining since the mid to late 1980s , and that younger Americans in particular are becoming increasingly irreligious . According to a 2012 study , Protestant share of U.S. population dropped to 48 % , thus ending its status as religious category of the majority for the first time . Americans with no religion have 1 @.@ 7 children compared to 2 @.@ 2 among Christians . The unaffiliated are less likely to get married with 37 % marrying compared to 52 % of Christians . 

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 According to a 2014 study by the Pew Research Center , 57 % of the population of the city identified themselves as Christians , with 25 % professing attendance at a variety of churches that could be considered Protestant , and 29 % professing Roman Catholic beliefs. while 33 % claim no religious affiliation . The same study says that other religions ( including Judaism , Buddhism , Islam , and Hinduism ) collectively make up about 10 % of the population . 

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 According to a 2014 study by the Pew Research Center , 68 % of the population of the city identified themselves as Christians , with 22 % professing attendance at a variety of churches that could be considered Protestant , and 32 % professing Roman Catholic beliefs. while 27 % claim no religious affiliation . The same study says that other religions ( including Judaism , Buddhism , Islam , and Hinduism ) collectively make up about 5 % of the population . 
