Historians say a president's not formally joining a Washington, D.C., church is consistent with precedent.
George W. Bush and his father, George H.W. Bush, were both "frequent attendees" at local churches but did not formally join a D.C. congregation.
Ronald Reagan publicly articulated the values of evangelical Christianity, but rarely attended church services. He also never became a formal member at a congregation in Washington.
Jimmy Carter, who joined First Baptist Church in Washington, stands out as one of the most prominent presidential church-goers. He attended 72 Sunday services at First Baptist while in office, according to records kept by the Carter Library.
And Bill and Hillary Clinton, who attended Foundry United Methodist church near the White House regularly but did not formally join, are perhaps the exception in modern history for first family participation in church life, experts say.
Obama and all former U.S. presidents professed faith in Christianity, with most men identifying as Episcopalians, according to the Pew Forum on Religion and Public Life. Obama is the first U.S. president who affiliates with the Christian Protestant denomination, the United Church of Christ.
ABC News' Sunlen Miller contributed to this report.