Abrahamic religions evolved from an earlier religion that we now call Yahwism. Yahwism is super different from Abrahamic religions and it developed alongside the religions of neighboring communities and as a result had a lot of syncretic interactions with them. A ton of inconsistencies in the modern Bible can be attributed to leftover scars from the syncretism and evolution of the religion.

A really interesting aspect of Yahwism is that it was polytheist, with an entire pantheon of gods. Yahweh even had a goddess wife. And he was definitely not the leader nor the most powerful of the gods in the pantheon. He was a warrior storm god, similar to Thor, except he controlled floods. El (now called Elohim), used to be an entirely different god. He took on the grandfatherly wise god role, and he was the king of the gods. Over time, El and Yahweh merged into a single god, and that’s why the God from modern Bible is so bipolar (loving and wise at one moment and bloodthirsty and vengeful the next) - it’s because the wise God stories originated from El and the bloodthirsty God stories originated from Yahweh

Also, Beelzebub arose because the original god (Baal) was a warrior storm god from a neighboring religion and the Yahwists thought that Baal was a Yahweh copycat and didn’t like him lol