There is no indication that the written version is over 3,000 years old. What language and script would it have been written in? There was no Hebrew, there was no arabic script.
To have a large body of history passed orally for thousands of years without error in transcription or translation is preposterous. Epic stories get seriously distorted in a few hundred years. Oh, I forgot, God Did It. The universal answer for the non thinker.
So9