>If the only reason something is moral is because an original creator declared it so then I don’t personally see the difference to us attempting to determine our own sense of morality based on what feels right. If it’s just an appeal to authority, why does it make a difference if that authority is god or human?

Well, because the god can stick you in a fire for all eternity if you follow the human's moral code instead. That's not really a great case for the soundness of their moral teachings but nonetheless presents a compelling argument for obedience.