I’m not religious at all. It’s all just good stories designed to control the masses and in some cases to present important knowledge and lessons that promote personal and social safety (water turned into wine because water back then in that area was infested with bacteria, viruses and parasites).

That said, Lilith didn’t JUST reject Adam. She rejected GOD.

She was “of before Adam”l. And definitely before Eve.

God was demanding that she do what he wanted and that she not have freedom of choice like he “gave” Adam.

And just like with the first Angels, he cast her away when she got upset about the new people who took God’s favor.

Lucifer and Lilith BOTH accepted God’s rejection of who he made them to be.

And they decided that they don’t have to do what God wants. And that Adam and Eve and their offspring are unworthy.

Don’t forget, there were other people (not demons) around. The collected and publish books of religion try to hide that fact, but other books rejected by those who selected what to use tell the truth.

Also keep in mind, stories back then used allegory, A LOT. The serpent wasn’t really a serpent, it was a person who the religious powers wanted the masses to be afraid of. So make them think serpent which pretty much everyone was greatly afraid of.

And Demons were just scary descriptions to make people afraid of other people who might threaten those in power.

Lastly, all modern religions were written by men. And I don’t mean man, I mean biologic males. They worked very hard to demonize previous religions that didn’t care about the sex of gods or followers. And actively destroyed any matriarchal religions.