1. he wasn't a god his whole life
2. the god maui on moana and maui is off from the rocks grandfather. Maui in the story Maui and the fish is quite different. He was weak and wanted to be a fisherman.
3. maui's brother is a fisher men and they don't think that he is strong enough to help so they kept leaving him behind.
I like watching things about Maui. There are lots of legends about him.