Sounds interesting, but just because things sound cool doesn’t make them real, just remember that. If you’re looking for answers to explain the world you won’t find it in demonology. As they say, truth is often more interesting than fiction, there is plenty of interesting stuff out there.
That being said, fiction is also cool. So as long as you understand that it is not a model of the real world, go down that demonology rabbit hole to your heart’s desire.