"Laws", or rules universally acknowleged to apply to a group as a whole for the protection of all, with consequences sanctioned by the group for their infringement, pre-date any known religion. Any group must accept certain rules, written or unwritten, in order to maintain order and a degree of cohesion necessary for protection as part of a group.

And membership within any group, requires compliance with the laws or rules that define it as such. For that matter, even amongst herd or pack animals, there are rules, or for that matter, laws, each member must abide by or face the consequences. Since safety is found in numbers, especially in a dangerous environment, it compells members of the group, or flock, to comply or risk expulsion, and the danger of being a lone individual subject to predation.

Therefore, I don't see laws or rules stemming from religion, or faith; the desire for order vs. chaos is inborn. We want rules to guide us; some folks have a harder time living within these guidelines. I believe religions were created...evolved... as a context in which to contruct a framework, and a plausible "storyline" for the laws and rules a group is subject to, and to help with their promulgation and enforcement.

Our current system of laws, are influenced heavily, if not based entirely upon Hammurabi's Code, and what was termed in England, "Natural Law".

Furthermore, "Christianity" as such, is not a religion. The term refers to an overall ideology spanning numerous religions, from Catholic to Lutheran to Episcopalian, and is used to differentiate from the "non-christian" religions...i.e. those who believe in a deity or deities. But, do not believe a dude named Jesus Christ appeared a couple thousand years ago with the goal of being publicly crucified in a mission to save everyone's soul.

Religion, in all its forms, merely capitalizes upon the need of the individual to have a set of guiding rules, and laws, and the need to the group for those rules to be followed...and vice versa. Need rules? We got 'em! And a cool story based on local mythology that neatly (although implausibly, that's why we call it 'faith') explains Why This Must Be So.

If these rules and laws were self-serving, in that they strengthened the power of the rule and lawmaking authority, so much the better...and thus evolved religion. Peace and harmony were easier to maintain, and as such, it's referred to as "morphine for the masses".

That is, until competition from other, regional groups resulted in squabbles over the inevitable "my imaginary friend is more powerful than your imaginary friend"...and we all know where that's led.