Clearly you are not familiar with the social contract, then. In that scenario, if there are laws in place in the community (which is what the social contract is all about), then I would report your behavior to others in my community. We would talk about it, agree that you are a danger to society, and endeavor to track you down, retrieve the stolen property, and subject you to whatever the punishment is for theft and assault.
Obviously sometimes the social contract fails, and I never suggested otherwise. If there is a local lord with a lot more resources than the rest of the community, and he happens to be a jerk, then we will be subjected to his whims and there's not much we can do about it besides eventually revolt. Then we would either put someone else in charge, someone we trusted, or go back to being a society of relative equals. (People with nothing at all still must rely on charity, though.)
I will say this for religion: organised formal charities have historically come from religious institutions, as well as education (or what passed for it back in the day) and caring for the sick. It also provided a sense of unity that would extend beyond the local community. If a visitor from out of town came by, we would be obligated to treat him well if he shared our faith, and would have something in common. He would be less of the "other" and closer to our ingroup, so we would feel less threatened.
Domino, you're saying that religion has always existed in some form. I agree, but I interpret it a little differently. Many of the morals that are taught across a wide variety of cultures are the same, which leads me to believe that morality comes not from religion itself, but people. Not to mention that many many gods had less interest in how people treated each other and more interest in bigger goats. If you look at some of the earlier stories, the Judea-Christian god was not much different in this respect, but I won't pretend to be any sort of authority on that.
As for the age of religion, Hinduism is the oldest, hands down. I learned this in a "World Religions" class several years ago and it simply predates every other religion that is practiced today. (This class included Judaism, for the record.)