Thomas Jefferson did make an attempt at "Christianity as philosophy" and so called "rational Christianity" -- culling out the supernatural, nescient, conflicting, morally insane / ruthless parts. Declaring himself Christian much in a moral philosophical and culture sense as atheist Marxists celebrated their ideological subservience to a socio-economic and political doctrine. (The "community member" aspect of Jefferson's philosophical version of Christianity maybe best indicated by his surprising rate of attendance at various small, local churches which perhaps cared less about adherence to rigid formula; as well as generous donations to their efforts.)
1816 January 9 - (Jefferson to Charles Thomson): "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, and themselves Christians and preachers of the gospel, while they draw all their characteristic dogmas from what it’s Author never said nor saw. They have compounded from the heathen mysteries a system beyond the comprehension of man, of which the great reformer of the vicious ethics and deism of the Jews, were he to return on earth, would not recognise one feature. If I had time I would add to my little book the Greek, Latin and French texts, in columns side by side, and I wish I could subjoin a translation of Gassendi’s Syntagma of the doctrines of Epicurus, which, notwithstanding the calumnies of the Stoics, and caricatures of Cicero, is the most rational system remaining of the philosophy of the ancients, as frugal of vicious indulgence, and fruitful of virtue as the hyperbolical extravagancies of his rival sects."
Rebecca Bowman: "He [Jefferson] also rejected the idea of the divinity of Christ, but as he writes to William Short on October 31, 1819, he was convinced that the fragmentary teachings of Jesus constituted the "outlines of a system of the most sublime morality which has ever fallen from the lips of man." In correspondence, he sometimes expressed confidence that the whole country would be Unitarian, but he recognized the novelty of his own religious beliefs. On June 25, 1819, he wrote to Ezra Stiles Ely, "I am of a sect by myself, as far as I know." --Monticello Research Report ; August 1997
1803 April 21 - (Jefferson to Benjamin Rush): "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."
1814 January 24 - (Jefferson to John Adams): "The whole history of these books [the Gospels] is so defective and doubtful that it seems vain to attempt minute enquiry into it: and such tricks have been played with their text, and with the texts of other books relating to them, that we have a right, from that cause, to entertain much doubt what parts of them are genuine. In the New Testament there is internal evidence that parts of it have proceeded from an extraordinary man; and that other parts are of the fabric of very inferior minds. It is as easy to separate those parts, as to pick out diamonds from dunghills."
1820 April 13 - (Jefferson to William Short): Among the sayings and discourses imputed to him [Jesus] by his biographers, I find many passages of fine imagination, correct morality, and of the most lovely benevolence; and others again of so much ignorance, so much absurdity, so much untruth, charlatanism, and imposture, as to pronounce it impossible that such contradictions should have proceeded from the same being.
1821 February 27 - (Jefferson to Timothy Pickering): "No one sees with greater pleasure than myself the progress of reason in it’s advances towards rational Christianity. when we shall have done away the incomprehensible jargon of the Trinitarian arithmetic, that three are one, and one is three; when we shall have knocked down the artificial scaffolding, reared to mask from view the simple structure of Jesus, when, in short, we shall have unlearned every thing which has been taught since his day, and got back to the pure and simple doctrines he inculcated, we shall then be truly and worthily his disciples: and my opinion is that if nothing had ever been added to what flowed purely from his lips, the whole world would at this day have been Christian. I know that the case you cite, of Dr Drake, has been a common one. The religion-builders have so distorted and deformed the doctrines of Jesus, so muffled them in mysticisms, fancies and falsehoods, have caricatured them into forms so monstrous and inconcievable, as to shock reasonable thinkers, to revolt them against the whole, and drive them rashly to pronounce it’s founder an imposter. had there never been a Commentator, there never would have been an infidel. In the present advance of truth, which we both approve, I do not know that you and I may think alike on all points. As the Creator has made no two faces alike, so no two minds, and probably no two creeds. We well know that among Unitarians themselves there are strong shades of difference, as between Doctors Price and Priestley for example. So there may be peculiarities in your creed and in mine. They are honestly formed without doubt. I do not wish to trouble the world with mine, nor to be troubled for them. These accounts are to be settled only with him who made us; and to him we leave it, with charity for all others, of whom also he is the only rightful and competent judge. I have little doubt that the whole of our country will soon be rallied to the Unity of the Creator, and, I hope, to the pure doctrines of Jesus also."
1823 April 11 - (Jefferson to John Adams) - "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 his 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 all this artificial scaffolding, and restore to us the primitive and genuine doctrines of this the most venerated reformer of human errors."
Jefferson in reference to the Virginia Act for Religious Freedom: "Where the preamble declares, that coercion is a departure from the plan of the holy author of our religion, an amendment was proposed by inserting 'Jesus Christ,' so that it would read 'A departure from the plan of Jesus Christ, the holy author of our religion;' the insertion was rejected by the great majority, in proof that they meant to comprehend, within the mantle of its protection, the Jew and the Gentile, the Christian and Mohammedan, the Hindoo and Infidel of every denomination."
