One of the points I try to share with friends whenever we discuss religion or the early days of America, is that our Founding Fathers were not atheists, so freedom of religion meant freedom to worship in the manner of one's choosing. Thomas Jefferson, like many prominent men of his day, were Masons, who referred to God in almost everything they did of consequence, as the Supreme Being. Recently, I learned that Thomas Jefferson published what is known as the Jefferson Bible, which is his version of the life and teachings of Jesus the Christ. Available from several sources, including one that supports the maintenance of Mr. Jefferson's home, the architectural gem known as Monticello.
To visit Monticello, see http://www.monticello.org/