Here is a great quote on the Christian position for the moral authority of God. See the full post here.
“I am attempting to bring out into the light how severe the moral double standard is that we often apply to God. In our ordinary, daily affairs, we invoke a set of straight forward and clear criteria for what sorts of things are wrong, which things are heroic, and which things are morally good. But in our ideas of God we throw all of that out. God is required to do none of the things we normally expect moral agents to do. If he acts like the worst sort of negligent monster, again that is overlooked. In effect, none of our judgments about good and evil apply to God, but we insist: not only is God good, he’s the ultimate exemplar of moral perfection. Nevermind that he doesn’t do any of the things that morally praiseworthy people do.”
H/T: Matt McCormick