We should let Jefferson speak for himself:
"To the corruptions of Christianity I am indeed, opposed; but not to the genuine precepts of Jesus himself. I am a Christian, in the only sense in which he wished any one to be; sincerely attached to his doctrines, in preference to all others; ascribing to himself every human excellence; and believing he never claimed any other." (1803 April 21. Letter Of Thomas Jefferson to Benjamin Rush).
"I too have made a wee little book, from the same materials, which I call the Philosophy of Jesus. it is a paradigma of his doctrines, made by cutting the texts out of the book, and arranging them on the pages of a blank book, in a certain order of time or subject. 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, very different from the Platonists, who call me infidel… (1816 January 9. Letter Of Thomas Jefferson to Charles Thomson).