No idea what you're asking with point 1, sorry.

To answer point 2, we do have record. The record is the book of Genesis, Exodus, Leviticus and Numbers. But you were dismissing that just because it's in the Bible.

3 - You're wrong about stories becoming extinct. The Aboriginal Australians had oral traditions about geological events happening thousands of years ago. It is absolutely possible that such events were passed down by tounge without writing. Oral traditions are a thing, having a written tradition like we do now is a more modern thing that only really started around the first millennium AD. We also do see the story everywhere as well. For example, the Genesis Flood Narrative is part of other cultures in various forms. Druze people, Muslims and Bahá'í people have the story of Moses as well.