Well, I heard that probably Jesus never existed as well. He's said to be personification of a savior character of some Jewish sects. Some guy named Paulus must have been so obsessed about this idea that he founded a new religion based on legends from these sects. There's an interesting book on this theory. "The Christ Myth" by Arthur Drews, from about 100 years ago. In the end it might turn out that the only religion founder who ever really existed was LaVey... Oh, and Linus Torvalds of course!