There is also the fact that people change. The religious fall away, the degenerate become born again christians, satanists become christians, christians become agnostics and athiests.
people who insist the founders were deist or chrstians are just trying to sell something. facts be damned.
jefferson is also quoted as saying: "I have examined all the known superstitions of the world, and I do not find in our particular superstition of Christianity one redeeming feature. They are all alike founded on fables and mythology."
He probably came across some lousy christan one day and it made him mad and he told him off.

The jefferson bible was made with the intent to 'civilize' the natives. he removed the supernatural stuff and just used the moral teachngs. Jefferson probably changed his mind because of the uproar it would cause. That's why he ended up keeping it private and personal and it never went into circulation.
fter the separaton of church and state, jefferson held church services in govt buildings.
Crazy christians and hypocrites and other `honor me with their lips` types probably made Jefferson distance himself from christanity the same as they do me.
He wrote referring to the 1804 version, "A more beautiful or precious morsel of ethics I have never seen; it is a document in proof that I am a real Christian, that is to say, a disciple of the doctrines of Jesus."
Jefferson stated in a letter (1819) to Ezra Stiles Ely, "You say you are a Calvinist. I am not. I am of a sect by myself, as far as I know."
Look up the wiki page on `Religious views of Jefferson`. Its a long page.