Christopher Hitchens takes the time to actually critique the Ten Commandments and ask whether they actually serve as a basis of morality and law since the founding of this country.
He takes them in order
The first four of the commandments have little to do with either law or morality, and the first three suggest a terrific insecurity on the part of the person supposedly issuing them. I am the lord thy god and thou shalt have no other ... no graven images ... no taking of my name in vain: surely these could have been compressed into a more general injunction to show respect. The ensuing order to set aside a holy day is scarcely a moral or ethical one, unless you assume that other days are somehow profane.
So none of those seem foundational for a legal system. Hmm. What about the middle ones?
The next instruction is to honor one's parents: a harmless enough idea, but again unenforceable in law and inapplicable to the many orphans that nature or god sees fit to create.
What about theft and murder?
There has never yet been any society, Confucian or Buddhist or Islamic, where the legal codes did not frown upon murder and theft. These offenses were certainly crimes in the Pharaonic Egypt from which the children of Israel had, if the story is to be believed, just escaped. So the middle-ranking commandments, of which the chief one has long been confusingly rendered "thou shalt not kill," leave us none the wiser as to whether the almighty considers warfare to be murder, or taxation and confiscation to be theft. Tautology hovers over the whole enterprise.
What about that coveting business?
Then it's a swift wrap-up with a condemnation of adultery (from which humans actually can refrain) and a prohibition upon covetousness (from which they cannot). To insist that people not annex their neighbor's cattle or wife "or anything that is his" might be reasonable, even if it does place the wife in the same category as the cattle, and presumably to that extent diminishes the offense of adultery. But to demand "don't even think about it" is absurd and totalitarian, and furthermore inhibiting to the Protestant spirit of entrepreneurship and competition.
As usual, when pointing out the absurdities of the overly religous, Hitchens is on the mark.