Some will say Thomas Jefferson was a deist, not an atheist. Atheism, h — Deism

"My parents had early given me religious impressions, and brought me through my childhood piously in the Dissenting way. But I was scarce fifteen, when, after doubting by turns of several points, as I found them disputed in the different books I read, I began to doubt of Revelation itself. Some books against Deism fell into my hands; they were said to be the substance of sermons preached at Boyles Lectures. It happened that they wrought an effect on me quite contrary to what was intended by them; for the arguments of the Deists, which were quoted to be refuted, appeared to me much stronger than the refutations; in short, I soon became a thorough Deist."

"Let reason count the stars, weigh the mountains, fathom the depths — the employment becomes her, and the success is glorious. But when the question is, "How shall man be just with God?" reason must be silent, revelation must speak; and he who will not hear it assimilates himself to the first deist, Cain; he may not kill a brother, he certainly destroys himself."

"I have generally been denominated a Deist, the reality of which I never disputed, being conscious I am no Christian, except mere infant baptism make me one; and as to being a Deist, I know not, strictly speaking, whether I am one or not, for I have never read their writings; mine will therefore determine the matter; for I have not in the least disguised my sentiments, but have written freely without any conscious knowledge of prejudice for, or against any man, sectary or party whatever; but wish that good sense, truth and virtue may be promoted and flourish in the world, to the detection of delusion, superstition, and false religion; and therefore my errors in the succeeding treatise, which may be rationally pointed out, will be readily rescinded."

"A less important point which needs to be made in this piece is that although the index of The God Delusion notes six references to Deism it provides no definition of the word ‘deism’. This enables Dawkins in his references to Deism to suggest that Deists are a miscellany of believers in this and that. The truth, which Dawkins ought to have learned before this book went to the printers, is that Deists believe in the existence of a God but not the God of any revelation. In fact the first notable public appearance of the notion of Deism was in the American Revolution."

"Who ever heard of a devout deist? Who ever heard of one who was willing to spend his life in missionary labor for the good of others? It is not according to the constitution of the mind that such a system should awaken the affections. And what is true of this system is true of every false system. All such systems leave the heart cold, and, accordingly, exert very little genuine, transforming power over the life."

"As to the Christian system of faith, it appears to me as a species of Atheism — a sort of religious denial of God. It professes to believe in a man rather than in God. It is a compound made up chiefly of Manism with but little Deism, and is as near to Atheism as twilight is to darkness. It introduces between man and his Maker an opaque body, which it calls a Redeemer, as the moon introduces her opaque self between the earth and the sun, and it produces by this means a religious, or an irreligious, eclipse of light. It has put the whole orbit of reason into shade."