You would THINK they would but honestly like, it's just sort of how things worked out. The angel-demon war thing was because they were trying to beat each other to the Unholy Grail which had popped up. So that's what caused that. And Lilith well...Lilith created the Nightside and she wanted to take it back over like she hadn't been gone for centuries so. It's just a coincidence that they were both sort of...related I guess? But honestly not all of our disasters are religiously affiliated it just happens that the apocalypses were?