Read the comments of historian Leo Ribuffo on Ronald Reagan and religion:

It should not be surprising, given the prevailing American mores of his era, his background as the child of a mixed Protestant/Roman Catholic marriage, and his years amid the flexible mores of Hollywood, that Ronald Reagan was a religious eclectic. As the writer Frances FitzGerald once observed, Ronald Reagan "believed in everything." At various points in his life he expressed interest in premillennial dispensationalist Bible prophecy, Bah'ai, and the Shroud of Turin. Americans sensed this and found silly Walter Mondale's charge in 1984 that Reagan was in the grip of fundamentalists and would let Jerry Falwell name the Supreme Court as openings occurred. (In my one contact with a presidential campaign, I tried to convince the Mondale people that this was not only stupid but also would fail because it was so obviously stupid.)

One could also easily place Reagan in the tradition of presidential civil religion (though the Christian right claims him as uniquely theirs, as they claim, with similar inappropriateness, presidents back to George Washington). Indeed, we could put side by side religious quotations from Ronald Reagan and FDR, and it would not be possible to tell who said what. Several hundred scholars, at minimum, could make these points, though most journalists remain ignorant (sometimes willfully so) of them.