Many religions, and Christianity in particular, speak of a deity as

[marylandblue]

21. Part of the Moses story was based on the Story of Sargon of Akkad.

The rest we don't know where it came from. There is no parallel Bronze Age story of escaping slaves. Even if there were, slave escapes are not unusual in world history.

Not sure what you mean by "there were no Jewish slaves in Egypt." Nobody was called "a Jew" until about 1,000 years later. So of course there were no Jewish slaves. There may have been a Semitic people called Israelites or Hebrews.

There were Semitic people in Egypt. There were slaves in Egypt. Some slaves were war captives, so there could have been Semitic slaves in Egypt. There could have been someone named Moses who escaped captivity with a small group of slaves. The escaping slaves may or may not have been Semitic. They could have joined with Semitic deserts nomads. Some of these nomads may have latter settled in Canaan, though probably not through conquest as described in Joshua.

Lots of "could haves" which is my point. The information is lacking. Unless you know something I don't about a story of Bronze Age escaping slaves.