I'd give credit to the Tower of Babel.
They all KNEW the Story; just re-told it in different languages.
true, but not even Abraham knew until God told him that in his seed all peoples of the world would be blessed.
Then it took God handing down the law to Moses to learn about certain do’s and dont’s about life, and unless Buddha was and Israelite, he would not have been given the law which many of the things he taught were from.