If you find a problem with staying within the rules of the world, it might be wise to just start afresh with something basic, and get used to how this world works and then introduce your premade character.
Because it sounds to me you have a lot of burden and backstory, that you can't let go with Niv, if you can't drop some of that excess baggage you will have trouble fitting in the with the setting. Or make sense of the logical confines of the world.
That is just from my point of view. unless you are saying even without the backstory you will still make a god character, then just leave it as it. because if that is the case, you will probably struggle with the rules regardless.