I'd be interested in reading this in context. Got a link?
"The truth is that the greatest enemies to the doctrines of Jesus are those calling themselves the expositors of them, who have perverted them for the structure of a system of fancy absolutely incomprehensible, and without any foundation in his genuine words. And the day will come when the mystical generation of Jesus, by the supreme being as father in the womb of a virgin will be classed with the fable of the generation of Minerva in the brain of Jupiter. But we may hope that the dawn of reason and freedom of thought in these United States will do away with all this artificial scaffolding, and restore us to the primitive and genuine doctrines of this the most venerated reformer of human errors."
-- letter to John Adams, 11 April 1823
Here's a link to all the: Jeffersonian letters
Here's the letter on CALVIN AND COSMOLOGY, which begins:
The wishes expressed, in your last favor, that I may continue in life and health until I become a Calvinist, at least in his exclamation of `_mon Dieu!_ jusque a quand'! would make me immortal. I can never join Calvin in addressing _his god._ He was indeed an Atheist, which I can never be; or rather his religion was Daemonism. If ever man worshipped a false god, he did._