Thomas Jefferson's God is Reason

"Fix reason firmly in her seat, and call to her tribunal every fact, every opinion. Question with boldness even the existence of a god; because, If there be one, he must more approve of the homage of reason, than that of blindfolded fear. You will naturally examine first the religion of your own country. Read the bible then, as you would read Livy or Tacitus."

"Do not be frightened from this inquiry by a fear of its consequences. If it ends in a belief that there is no god, you will find incitements to virtue in the comfort and pleasantness you feel in its exercise, and the love of others which it will procure you."

"Your own reason is the only oracle given you by heaven , and you are answerable not for the rightness but the uprightness of the decision. . ."

Jefferson's letter to his nephew, Peter Carr (August 10, 1787).