This looks like a worthwhile resource of quotes from the Founders on religion. The editor, James Hutson of the Library of Congress, is a historian of distinction on the subject. From an interview with Christianity Today:
[The framers had] a wide variety of opinion on a wide variety of subjects. But the subjects on which there was a kind of consensus emerged very clearly in the book. I have found no one among the Founders who didn't believe in Providence being actively at work, who didn't believe that religion was vital for social well-being, who didn't believe in liberty of conscience.
[Q:] Some say that the Founders were mostly Deists, others that they were really born again Christians.
[A:] . . . Most of the leading people were not, I suspect, what you would call in today's terms "evangelical Christians." Some of them, however, were very deeply orthodox Christians, such as John Jay, the first chief justice. Elias Boudinot, the president of the Continental Congress and the first director of the U.S. Mint, would qualify as an evangelical Christian under any definition of that term. The population at large certainly was preponderantly orthodox or evangelical, but the founding group was substantially more liberal.
Tom B.