Seems you're more on the theological side of this 'un. So... yeah.
A christian god seems to be one that would absolutely lay down a set of rules, to keep order. From the first stories of Eden, once we ate from the tree, we were then supposed to know what 'sin' is. We're supposed to know right from wrong, and make the choice to "not be wrong", from within ourselves. The fact that we have 'free will', as it were, and the very concept of the 'fallible human steeped in original sin' says that by nature, man as a creature is self serving. If the commandments themselves came from this god, they were put there so we further knew what the rules were to get into his kingdom, et cetera.
It still seems like your examples are kind of... broken, though. I think even thieves grow up knowing it's socially 'wrong' to steal. But the ends justify those means. And that circle, it may be perfectly permissible.
Again, I feel it comes to ethics vs. morals. An ethical man knows what is right. A moral man will try to ~do~ what is right.