Christianity, Islam and Judaism are based off real people who have walked the Earth. Scientology believe that we lived on another plants before we were born on Earth....
Just for the record, the religious figures of Judaism (and of the Old Testament generally) are largely if not completely unattested. For example, there is currently essentially no archaeological evidence that there was ever a substantial Jewish population in Egypt in pre-Roman times, let alone that the entire Jewish population had relocated there.
Yes there is, them big things that are pointed up in the sky... Just picking, I don't much about archaeolgical evidence so I can't say there is or isn't.
Heh, as a Jew I appreciate the attempt, but there is no evidence of Jews in Egypt. And I would imagine that there would have been reports of the plagues somewhere in the world, considering that Egypt was a major center of its time.
That said, there is evidence that many Jewish figures, such as David, did exist at some point in history. Whether some of the greater aspects of the story are more metaphorical does not mean that this civilization didn't exist.
On the other hand, scientology is made up. Their figures have ever existed and are ridiculous.