SO. THERE IS THIS GAME CALLED SCION. ITS PUBLISHED BY WHITE WOLF. THAT IS ALREADY A POSITIVE. THE PREMISE IS THAT YOU ARE CHILDREN OF THE GODS TRYING TO SAVE THE WORLD. THINK PERCY JACKSON MEETS AMERICAN GODS.
The different pantheons meet up and discuss the philosophical ramifications of their existence. How can multiple contradictory religions all seemingly be true? Do pantheon-specific purviews imply there are aspects of reality that only exist for some people, and what does this say about metaphysics? What does the existence of multiple afterlives, with different and contradictory standards for judgement, say about morality? What does fate-binding say about the relationship between reality and humanity?
No-one fights titans or anything. You just roleplay this debate happening for, like, ten sessions. At least.