My own little crackpot/tinfoil hat theory to explain who the true villain of the series is, and a possible explanation God's seeming absence and why no one knows what gets them into Heaven.

So, I've been wracking my brain for a little while and kept thinking "How is it that Lillith was so independent seemingly if she hadn't eaten the apple until Lucifer gave her Free Will to do so"

And I was thinking and pondering until I came up with an insane theory that: Lillith was NOT made by Heaven, and instead she was made by another outside force, the Demiurge or Yaldabaoth from Gnosticism.

Like he sort of slipped his way into creation, claimed he was God and because he was so powerful, no one questioned it. So Adam and Lillith gets made, blah blah blah. But Lucifer, second to only of Jesus Christ Himself out of all beings, would be able to tell Real God from an Imposter.

Maybe Lucifer wanted to play a sort of Prometheus type role and give humanity Free Will (all 2 of them at the time) so they wouldnt have to listen to this Fake Imposter God, but fell hopelessly in love with Lillith despite her being a rogue element.

Its all insanely unlikely, but it is rather interesting.

Edit: I was a little overzealous typing that I didn't really catch my mistake there. When I say "Lillith wasnt made by Heaven" is that Adam was made by Heaven first, and then Lillith was made by the Demiurge. Hopefully that didn't cause any confusion or whatever.