You lost me on trying to stop an entity, of sorts, who arguably makes no conscious acts, sounds like an awfully weak excuse to become a Lord of Hell, or possibly a patsy to provide a distraction.
Don't listen to the cynical old bird, I'm sure you are quite the unholy terror.
I recall seeing James Jacobs answer a question in which he expressed a strong dislike of the idea of anything like the Blood War occurring in the Golarion setting.
However, the emphasis in places like Cheliax on Law vs. Chaos being more important than Good vs. Evil suggests that there would be tremendous conflict between devil worshipers and demon worshipers even if the devils and demons themselves are not actually at war.