The fault lies not in the statutes and ordinances as written, but in the selective enforcement of these same statutes and ordinances.
This is precisely why we don't need them posted up - the ones that are in law (kill/steal) have been in many other societies, religious and non religious, and can pretty much be agreed upon by all (ignoring their rather simplistic nature). The others (no other gods, no craven images) are pretty much scaremongering, and have no use to non-christians.
As an aside, do you really think that these simplistic rules will affect the crime rate, and instill 'morality'??
The ratification of the 1st Amendment completely precluded the Ten Commandments from being established as law.
Most diligent scholars of law can find every one of the commandments buried somewhere in the law codes adopted everywhere in Western societies, particularly in the United States and in every state of the Union.
Yeah, right. Lets start with the very first one:
"I am the Lord your God, who brought you out of the land of Egypt, out of the house of bondage. Thou shalt have no other gods before me."
Try enforcing that one. Good luck. You're going to need an awful lot of cattle cars to bring all us non-believers to internment camps for the ghastly crime of not honoring the religion of the State.