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Is eating beef moral? Why or why not? What about pork? Rabbit? Horse? Dog? Why is it "okay" to eat some animals and not others? Relativism. So the odds of having one inviolate law that applies to each and every society is incredibly small - laws and mores are determined by the cultural needs of society.

We all understand that dietary laws for others, e.g. eating pork, don't apply to us and customs for others, e.g. how to kiss, don't apply to us. Morality has to do with how we treat one another.

We already know that we should have compassion and that we should strive for justice. The problem is the authority behind that knowledge. If it is just a feeling we get, i.e. conscience hurts us, then it has no authority for what obligation do we owe to a feeling?

It is only if we think that God mandates compassion and justice that we will think those things to be an obligation.

If we think that morality is just social custom, then we'll start to see that we're being manipulated by the previous generations and we'll resent it.

as a matter of fact, there has never been any such thing as an absolute moral law. so moral relativism is rather forced upon us, to a greater or lesser extent.

Moral absolutism fails. There is always at least one legit reason for doing something against some absolute. Kant had a famous example of a murderer looking for a friend of yours. You know where your friend is, and the murderer asks you to give him up. The right thing to do here is to lie. In Armenia, it is common and acceptable to kiss your children on the mouth, but when an Armenian man moved to the US social services took his kids away. In Armenia this kind of behavior doesn't smack (sorry no pun intended) of abuse, but here it does.

All morality is subjective, for its just human beings who decide what is and is not moral. Morality differs in different times and in different places.