Despite Jefferson's Danbury Letter indicating a separation of church and state, leading to an indication that Jefferson did not want the church to play any hand in the Federal Government, Jefferson was still an avid church goer to services that were held in the Capitol Building in Washington, DC.
In his diary, Manasseh Cutler (1742-1823), a Federalist Congressman from Massachusetts and Congregational minister, notes that on Sunday, January 3, 1802, John Leland preached a sermon on the text "Behold a greater than Solomon is here. Jef[ferso]n was present."
Thomas Jefferson attended this church service in Congress, just two days after issuing the Danbury Baptist letter. Leland, a celebrated Baptist minister, had moved from Orange County, Virginia, and was serving a congregation in Cheshire, Massachusetts, from which he had delivered to Jefferson a gift of a "mammoth cheese," weighing 1235 pounds.