Religious affiliations of presidents of the United States

The religious affiliations of presidents of the United States can affect their electability, shape their stances on policy matters and their visions of society and also how they want to lead it. Speculation of Thomas Jefferson, Abraham Lincoln, and William Howard Taft being atheists was reported during election campaigns, while others, such as Jimmy Carter, used faith as a defining aspect of their campaigns and tenure to hold the office.
Almost all of the presidents can be characterized as Christian, at least by upbringing, though some were unaffiliated with any specific religious body. Protestants predominate, with Episcopalians and Presbyterians being the most prevalent. John F. Kennedy was the first Catholic president and Joe Biden, the current president, is the second. There have been at least four nontrinitarian presidents. No president has openly identified as atheist.
Formal affiliation.
Most presidents have been formal members of a particular church or religious body, and a specific affiliation can be assigned to every president from James A. Garfield on. For many earlier presidents, however, formal church membership was forestalled until they left office; and in several cases a president never joined any church. Conversely, though every president from George Washington to John Quincy Adams can be definitely assigned membership in an Anglican or Unitarian body, the significance of these affiliations is often downplayed as unrepresentative of their true beliefs.
The pattern of religious adherence has changed dramatically over the course of United States history, so that the pattern of presidential affiliations is quite unrepresentative of modern membership numbers. For example, Episcopalians are extraordinarily well represented among the presidents compared to a current membership of about 2% of the population; this is partly because the Church of England, from which the Episcopal Church is derived, was the established church in some of the British Colonies (such as New York and Virginia) before the American Revolution. The Episcopal Church has been much larger previously, with its decline in membership occurring only in more recent decades. The first seven presidents listed as Episcopalians were all from Virginia. Unitarians are also overrepresented, reflecting the importance of those colonial churches. Conversely, Baptists are underrepresented, a reflection of their quite recent expansion in numbers; the list includes only two Catholic presidents including the current president, although they are currently the largest single denomination, and there have been no Adventist, Anabaptist, Lutheran, Eastern Orthodox, Pentecostal, or Latter Day Saint presidents.
While many presidents did not formally join a church until quite late in life, there is a genre of tales of deathbed conversions. Biographers usually doubt these, though the baptism of James K. Polk is well documented.
Personal beliefs.
The inner beliefs of the presidents are much more difficult to establish than church membership. While some presidents have been relatively voluble about religion, many have been reticent to the point of complete obscurity. Researchers have tried to draw conclusions from patterns of churchgoing or religious references in political speeches. When explicit statements are absent, it is difficult to assess whether the presidents in question were irreligious, were unorthodox in their beliefs, or simply believed that religion was not a matter for public revelation.
On the other hand, there are several presidents who considered themselves aligned with a particular church, but who withheld from formal affiliation for a time. James Buchanan, for instance, held himself allied with the Presbyterian church, but refrained from joining it until he left office.
Some presidents changed their beliefs and affiliation at some point in their lives; synthesis of statements and membership from different periods can be misleading.
Deism and the Founding Fathers.
Deism was a religious philosophy in common currency in colonial times, and some Founding Fathers (most notably Thomas Paine, who was an explicit proponent of it, and Benjamin Franklin, who spoke of it in his Autobiography) are identified more or less with this system. Thomas Jefferson became a deist in later life, and Washington, James Madison, James Monroe, and John Tyler are often identified as having some degree of deistic beliefs.
Unitarianism and Nontrinitarianism.
Four presidents are affiliated with Unitarian churches, and a fifth (Jefferson) was an exponent of ideas now commonly associated with Unitarianism. Unitarians fall outside of Trinitarian Christianity, and the question arises as to the degree to which the presidents themselves held Christian precepts. The information is generally available in the statements of the presidents themselves; for example, John Quincy Adams left detailed statements of his beliefs. William Howard Taft, a Unitarian, is noted to have said in a letter to a friend, "I am interested in the spread of Christian civilization, but to go into a dogmatic discussion of creed I will not do whether I am defeated or not. ... If the American electorate is so narrow as not to elect a Unitarian, well and good. I can stand it."
Two presidents were Quakers (Herbert Hoover and Richard Nixon) and information about their religion is harder to come by. Quakerism is, by its nature, not circumscribed by doctrines, but even so it is hard to determine whether either Hoover or Nixon had much adherence even to Quaker practice. For instance, it is common among Quakers to refuse to swear oaths; however, recordings show that Nixon did swear the oath of office in the conventional manner in all cases, and while the matter is clouded for Hoover, there is newspaper and circumstantial evidence that he did likewise. While Abraham Lincoln never officially joined a church, there has been some research indicating that he may have had Quaker leanings. During his time in office, he had numerous meetings with Quakers and had investigated a supposed Quaker ancestry.
The only other president with any association with a definitely non-Trinitarian body is Dwight D. Eisenhower, whose parents moved from the River Brethren to the antecedents of the Jehovah's Witnesses. Eisenhower himself was baptized in the Presbyterian church shortly after assuming the presidency, the only president thus far to undergo such a rite while in office; and his attendance at West Point was in sharp opposition to the tenets of the groups to which his parents belonged.
Nonreligious presidents.
There are some presidents for whom there is little evidence as to the importance of religion in their lives. For example, almost no evidence exists for Monroe's personal religious beliefs, though this may be the result of the destruction of most of his personal correspondence, in which religious sentiments may have been recorded. As with claims of deism, these identifications are not without controversy. No president has declared himself to be atheist.
Civic religion.
St. John's Episcopal Church (built 1815–1816) just across Lafayette Square and north of the White House, is the church nearest to the White House, and its services have been attended at least once by nearly every president since James Madison (1809–1817). Another Episcopal church, Washington National Cathedral, chartered by Congress in 1893, has hosted many funeral and memorial services of presidents and other dignitaries, as well as the site of interfaith presidential prayer services after their inaugurations, and the burial place of Woodrow Wilson.
Presidential proclamations, from the earliest days, have often been laden with religious if not explicitly Christian language. In at least two cases, Presidents saw fit to issue denials that they were atheists. At the same time, this was tempered, especially in early years, by a strong commitment to disestablishment. Several presidents especially stand out as exponents of this. Consideration of this has become increasingly contentious as topics such as civil rights and human sexuality have increasingly put churches at odds with each other and with the government.
List of presidents with details on their religious affiliation.
For each president, the formal affiliation at the time of his presidency is listed first, with other affiliations listed after. Further explanation follows if needed, as well as notable detail.