you tell me, how does god establish something is moral or not? you can just quote craig if you like..
If you look a bit further down the vid, I'll admit that WLC get's his ass handed to him. His main contention raises a good point, though. Any objective morality must be established by something/someone unchangeable. It must be absolute. We have seen from culture to culture, from empire to empire, that what is moral is subjective. Eating animals alive is a practice in some Asian countries. They see nothing wrong with it. Abortion isn't condemned in Western countries.
Allow me to explain this as best I can. I think it makes sense to me. God, as the Ultimate Authority, also has the Ultimate Power. He has the power and authority to homogenize all the differing moralites and make it into one. This solves the problem of conflicting moral values that our pluralistic society offers. It feels as if we are always trying to offer something better, but it is that very action that ends up dividing us all, in the end.
Put simply, if we could all agree on what is moral, we wouldn't even be having this discussion, but God as a perfect agent, has the power to consolidate one single, functional morality, regardless of what we think is and isn't. Sounds a bit dictatorial, but what better solution do you have?