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You're wrong. There were at least two. George Washington and Thomas Jefferson.
Technically, no, George and Tom were Christians ... specifically they were Deist. Deists believe in free will, not dogma. Deists may doubt the more literal interpretations of the Bible (i.e. they are to the "left" of Fundamentalists) and some may express doubt, too, about the divinity of Christ but they are still, nonetheless, considered to be Christians.