...How odd that the legal system follows the Biblical system of 'an eye for an eye'...
How odd that you don't see that the Biblical system actually follows the moral codes of humanity that preceded it by about ten thousand years of recorded history and probably about a hundred thousand years in total. Odd too that you credited cave men (older than God and Jesus) with the moral codes and forgot about it at the end of your post. 
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Didn't forget, just haven't seen a code of conduct written by a cave man at Walmart. Yes, there are many belief systems older than Christianity. And there are moral codes older than the Bible. But all those codes are followed through in the Bible and since it is the most recent writings of a moral code used worldwide, I used it. The laws in the US have a basis in moral beliefs that I think were derived from Christianity. The founders did not want a pure Christan theology but realized that the basic Ten Commandments summed up preventing chaos quite well. So laws were born from morality. Now whether morality came from religion solely or not is another question.