I am currently reading Lucifer solo series by Mike Carey (so far I finished book 6). I also never read the Sandman series.
So far my understanding of the series is such that God is the original deity, creator of all and also that the series is sticking very closely to the Hebrew version of the Bible. That said, the books also feature non-Hebrew, non-Christian deites, such as Norse gods and some Japanese ones as well. The Lucifer and other angels seem to be superior to these deites in terms of raw power, but there are also planes of existence where angels have no powers whatsoever.
Well, what is the origin of those deites and planes of existence? Is it all created by God? If so, why would he allow humans to worship anyone other than himself? Why should there be planes of existence that negates abilities of the angels?
Alternatively, if those deites were on the same power level as God and created they own realities in a way
Lucifer did himself and became God in his own reality,
how would that be possible if God had to
give Lucifer "permissions" in the first place to do so?
Thanks for explanations in advance.