Some interesting thoughts and problems arose thanks to the setting. Do demons reproduce? If they do, is a demon baby evil by nature? Yet does that not argue against the idea of Free Will? The Fallen Angels made the choice to follow Satan. They weren't born bad, so why would their children be?
And if they are born evil, and had no choice in the matter, what sort of viewpoint does this support? Is it not analogous to the view that peoples and nations on earth are good or evil as a whole?
I suspect that there'd have a multiplicity of views, kept down by the iron rule of a necessarily oppressive ideological system. Obviously not something that Theologians would agree with, but essential to the story I intend to tell.
In the end, everything is about us.