All 3 of the major religions can be traced back to ancient Summeria and even firther back than that. All of the miracles that were wroet anout in the bibles had happened before these religions ever exited and then they co opted them into there own version of the religion. And so many of the miracles are just so much nonsense.
If someone walked up to you on the street and said he had just talked to a burning bush that said he was god, what would you think? Yeah the same everyone would, he's nuts.
It makes more sense that there were ancient aliens back then and even thats pretty bizarre. But atleast it could explain a few things. People make up fantasies when they run into something they can't explain with there limited knowledge.