The abyss is mostly a wasteland filled with countless demons, demons are almost impossible to kill their, and the fact that the gods go out of their way to make their own territories and then never once try to purge the abyss leads one to conclude that the abyss might have a very negative effect towards gods. If not then what reason do you have for as to why the gods haven’t tried to destroy the demons sooner apart from giving their followers a common evil enemy for whom they need show remorse which will cause them to seek protection from a higher power?