Some would claim that the Bible is the most successful fantasy story ever written. Some would say the Bible is Truth. Nothing but the Truth.
However, using ideas and iconography from established philosophies and religions is usually not put-upon.
The Chronicles of Narnia without C. S. Lewis’ Christian belief could perhaps be a story, but permeated with it as it is, it would also be a very short and nonsensical one. Aslan would perhaps not suffer so much though.
The new trend is using Christianity unashamed.
For years, you could enjoy demons and even angels without questioning if God is real or not.
Hell used to be a place where bad things happens repeatedly, with freeway gates shuffling living and dead back and forth. With or without Lucifer’s blessings.
Lucifer might not even be a part of it. When he was, he did it without longing for God’s approval because God did not need to exist in the story.
Now it seems we need to have God smack in the middle. We cannot have demons and angels without it being a fight where God is a main player, although missing from the picture.
As I have said, I have no problem swallowing the angel stuff in both these stories without God. They are fantasy stories after all.
Why the sudden need for God?