Don't even argue? How about, "Don't act like you know everything." Our current American laws are secular and humanistic, much to the chagrin of the religious right. Are you saying that there was no law before Christianity was around? What about Hammurabi's Code? What about every civilization that existed before Christianity? In America, it is not illegal to defy most of the Ten Commandments. Let's go over them all and see how much the Bible has actually contributed to our laws.
I. Thou shalt have no other gods before me.
1. It's not illegal to believe in other gods.
II. Thou shalt not make unto thee any graven image.
2. I guess all of those artists are out of luck.
III. Thou shalt not take the name of the LORD thy God in vain.
3. Not illegal.
IV. Remember the sabbath day, to keep it holy.
4. Not a law.
V. Honour thy father and thy mother.
5. This is in no way a law.
VI. Thou shalt not kill.
6. This is a law, but only in some situations. For instance, it's not illegal to kill in self-defense, nor is it illegal for American soldiers to kill their targets, nor is it illegal to execute criminals in some states. Hell, this law hasn't even been enforced that much in the last few hundred years. It used to be legal to kill someone for trespassing on your property, even if they had committed no other offense.
VII. hou shalt not commit adultery.
7. Not illegal in the slightest.
VIII. Thou shalt not steal.
8. Definitely illegal. So far you're two for eight.
IX. Thou shalt not bear false witness against thy neighbour.
9. It is illegal to lie unless one is under oath, but elsewhere it's pretty much accepted as part of life.
X. Thou shalt not covet any thing that is thy neighbour's.
10. Perhaps the most ridiculous of all of the commandments, this one actually contradicts our economy's reason for growth. If it was illegal to covet, well, capitalism would not exist.
So there you have it. About three (I'm being generous) out of the ten are represented in our legal system. But guess what - those three have been illegal in many societies far before Christianity was ever around. Now, if you're going to add any of those crazy laws in Leviticus to our American justice system, you'd have to be some hardcore fundamentalist Christian. But I doubt you'd go that far.
Well, there's my evidence refuting your argument. Not that you had backed it up in the first place, but I like to be thorough.
How about
this and
this? Do they help put it in a humorous perspective for you?
This could be a fun debate if someone wants to start a topic for it.