to Conclude that Moses was fictional, you have to show that my other two possibilities are wrong (They ripped off the Bible, or the Bible used what people knew to teach theological truths in a way they could understand.)
Well, seeing as the myths I reference predate the Torah by a few hundred to a thousand years, unless ancient Jews had some sort of time travel machine, we can scratch #1 off the list. These cultures did not retroactively adjust their ancient beliefs to fit the Jewish mythology.
As for #2, I don't have a problem with that concept. It's ENTIRELY possible that the first people hearing about Moses knew full well that this was just a rename of an earlier law bringer from a religion they were already familiar with.
However, the point is that MODERN DAY people believe that this was a historical figure and that the Bible is a literal account of his behaviors.
That's simply not the case.
At BEST you could argue that there was a historical man (be it Moses, Jesus or Elvis) who later was attributed with magical powers in order to form a religion.
That still violate the Creationist core belief that everything in the Bible, even the mistakes, is 100% the word of God.
As soon as they make that statement, the game is over. The Bible simply isn't a historical account.
If you want to say "The teachings in the Bible are morally superior to X" then you've got room for discussion.