Religious affiliations of presidents of the United States

Religious affiliations can affect the electability of the presidents of the United States and shape their stances on policy matters and their visions of society and also how they want to lead it. While no president so far has ever openly identified as an atheist, Thomas Jefferson, Abraham Lincoln, and William Howard Taft were speculated to be atheists by their opponents during political campaigns; in addition, a survey during the first presidency of Donald Trump showed that 63% of Americans did not believe he was religious, despite his professed Christian affiliation. Conspiracy theorists also falsely circulated rumors that Barack Obama was a Muslim during his 2004 Senate campaign and later time as President. Conversely, other presidents, such as Jimmy Carter, used their faith as a defining aspect of their campaigns and tenure in office.

Essentially all of the presidents can be characterized as Christians, at least by upbringing, though some were unaffiliated with any specific religious body. Mainline Protestants predominate, with Episcopalians and Presbyterians being the most prevalent. John F. Kennedy and Joe Biden are so far the only Catholic presidents.