Nearly every U.S. presidents professed to be Christian, particularly Protestant. Most identified as Episcopalians, Presbyterians, Baptists, or Methodists.
A recent Pew report demonstrates that the America Obama leaves behind in 2017 is much different than the America that embraced him in 2009. One of the more significant changes is how Americans identify with or distance themselves from religion.
Inaugural prayers have become one of the rites of American civil religion. The venerable tradition of civil religion seems more important now than ever.