True Gods are magical
Do you believe this story has true magic in it?
If what people say about Imu is true, then he is the Earth God, the Forest God, and the Sea Devil all at the same time.
He made the Devil Fruits, cursed the Sea, and has existed in the First World, the Second World, and the Third World.
This would mean he survived the world being destroyed twice.
Does anybody question any of that? Of course not. They're gullible.
Note: A tiny handful of people question it. The vast majority believes it.