William Lane Craig is perhaps one of the few powerful debaters left on the side of zombie Jesus, so I strongly recommend you listen to what he has to say and determine for yourself how wrong he is about the concept of God being the superior objective moral standard.
My 2 cents? Is something good only because God determines it to be good? If there is a definite moral objectivity, how is unquestioning authority a solution to this? If he admits morality changes over time, then how does this reflect the image of a never changing God?