It also matters that Paradise Lost actually cares about and intends to extend the Christian mythos, and Final Fantasy does not attempt to do that with Hinduism. I'd also say that things like the Divine Comedy count. I don't see why they wouldn't.

I'd even say that a game like Darksiders is "Christian mythology" in setting or at least inspiration, even though it obviously has very, very little in common with the source material, however strict you want to be with the source material.