I’m trying to find the book.
It was written by Federer, about the religious statements and writings of the founders. All my books have been boxed up.
Jeffersons letter and the FBIs restoration work are among the items in an exhibit at the Library of Congress called, "Religion and the Founding of the American Republic." The exhibit also notes that Jefferson began to attend worship services held at the House of Representatives two days after writing the letter, and that he permitted regular worship services to be held there, a practice that continued until after the Civil War, with preachers from every Protestant denomination appearing there. The Library of Congress exhibit records that
As early as January 1806 a female evangelist, Dorothy Ripley, delivered a camp meeting-style exhortation in the House to Jefferson, Vice President Aaron Burr, and a "crowded audience."...In attending church services on public property, Jefferson and Madison consciously and deliberately were offering symbolic support to religion as a prop for republican government. [19][20]