A "small" problem in the backstory ...
If only a
handfull of Earth's mightiest volcanoes blew at the same time there probably wouldn't be enough humanity left to care about demons--or any religion at all.
(This info comes with compliments from my nephew in grade 4, whom I did not tell why I asked.
)
A good place to start looking for a story change can be found here:
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Take care,
e-d