It’s never the real god, just a physical avatar. There’s still a lot of Batman vs Superman narrative horseshit in the idea though

“Oh you surprised the guy who moves faster than most speedsters and can hear and see everything around him. Sure, okay, then he leaves and throws an asteroid he found within half a second from orbit before you’re done blinking”

DnD avatars don’t really scale that hard but neither do PCs so all of those fights revolve around the avatar being stupid or using a McGuffin