This is why they used to burn witches lmao. It's faster than answering all those assumptions. Especially if you have much better questions than answers...
I'll try: personally, I have found the distinction between Creator and creature/creation to be the most important one there is.
This doesn't mean "total separation from God" at all. It just safeguards against full ego inflation (I am a god).
Everything comes from God, but not everything IS God. Just like the river comes from the source, but isn't the source.
There is nothing more tragic-comic than humans who think they are gods. We can't even shit without wiping our asses, well, I guess we can, but you know what I mean.
As for the "duality", I don't think there is one in what I said. Just mentioned two paths... I'm all about the trichotomy, call it body, mind, soul, or satan, lucifer, Christ.
But I think there's a duality between good and evil and those who think they are gods tend to be on the evil side of it.