What lead to Abraham believing it was God who spoke…

What lead to Abraham believing it was God who spoke to him?

This same God could also make beings that could make their own world, if God willed the desire to make such beings. Such a being could obviously perform miracles and fortell true prophecies in his/her world.

Abraham obviously believed God didn’t make such beings, or, he believed that it wasn’t that being who spoke to him.

What lead to Moses believing it was God and not a being could could’ve made? What was the evidence?

Did he just assume that there’s no beings superior to humans but inferior to God who could make universes as we can make video games?