Anybody see the debate on MSNBC about this? It was between a Catholic priest and a law professor, I think? Quite interesting.
In short, the priest stated that it's not establishing a particular religion but honoring historic roots. Contrarily, the professor disagreed and said that it alienates non-christians and unbelievers.
But, here's the sticky point. The professor said that commandments 5-10 are generic and that those laws are generally reflected in most religions today. However, when you begin to legislate commandments 1 - 4, then you have a problem. That is why she said that the commandments shouldn't be displayed.
I don't understand why they always have a priest to represent Protestant beliefs. The RCC has their own set of 10 Commandments. Also, he mentioned that the US has always had Blue Laws (Sunday worshipping) on books which honored the Sabbath. What the priest fails to realize is that the 4th commandment specifically states the 7th day, not the 1st. So, I find it hypocritical for him to even mentioned that.
IMO, US needs to legislate the last 6 commandments are else, we have anarchy. But, when you legislate the first 4, then you begin to establish a state religion, which will lead to a religio-political system...and ultimately, the end times. That's why I believe the commandments were written on two tablets.