"So if God is the arbiter of what is moral, and you insist God doesn't change, how did God decide to change it's mind on what is moral? You keep trying to have things both ways."
This is what humans do, and there is nothing that suggests there's a God involved. But either morals from God are absolute or they are not. If morals aren't absolute then God can do anything, and humans have no authority to answer to as a judge. So we are back to humans doing whatever they want and getting away with it, like Nazi Germany. Like slave owners. Any genocide is justified since there is no absolute morality, and morality changes, and the God is consistently absent.
Huh?