That kinda sorta suggests the answer (you believe that Hammurabi’s Babylonian gods were, in fact, real), but isn’t clear. Can you work on that?
No, I'm not saying Hammurabi's gods were real. I'm saying that a moral system derived by men means nothing, because there is no foundation for it. As I said, who is to say that stealing is wrong? For example, Richard Dawkins recently said included "wicked" as one of the possible characteristics of a person who doesn't believe in evolution. Well, Dawkins arrived at that moral judgement without believing in God, but by what moral standard does he judge a person to be "wicked"? Wouldn't such a person just be choosing to do something they feel is an appropriate lifestyle?
Even if a person really can figure out a moral system without a belief in a higher power, that only proves something about their mental process, not about the nature of morality. It could be that they're recognizing a basic moral order that exists in the Universe because of a Creator, not despite one.