Continuing with the idea of Capital E Evil, I even think the idea of "evil gods" could be excised from D&D.
Correct me if I'm wrong, but historically in polytheistic mythology (such as Ancient Greece and Ancient Egypt), there aren't really "evil" gods. There are gods in conflict, and trickster gods, and gods of war, but as far as I know there wasn't an Ancient Greek God of Evil.
To me, it's much more useful to have Gods with Motivations. What does Gruumsh want? What does Vecna want? Most likely they want things that are antithetical to the desires of the heroes and the cultures they come from. To me, that's enough, and far more interesting than just labeling them (and those who worship them) as Evil.