MC and a a JK from the same town die. MC dies in a car accident, JK commits suicide.
The JK goes on to become a saint and pushes human supremacy for whatever reason because it is fun or entertaining, or at least, more so than whatever her miserable time on Earth was in comparison.
On the other hand, the MC is picked up by a distinctly different god with a very different objective than whatever god reincarnated the JK. MC gets a miserable experience, but matures a little, and finds various people in the new world that he feels genuinely care about him now, unlike his cold, stern father.
The saint uses her powers and position for "evil", and the boy of ill omen uses his ambiguously evil powers for "good". Simple stuff.