A man replacing a god

A self insert story, a man replaces the greek God Poseidon despite such a major thing not being one of his wishes. He spends this new life making the best of it he could, having no care how he changes the lore of what myth or stories originally would be.
Greek lore for the most part will be botched in favor of creating the story I want to pursue. The family tree of the major figures/gods will be altered and some lore will be changed to better explain certain things in a fashion I choose.