I agree with Rick, there are bigger problems up there. But I find this topic interesting for quite a few reason including the large amount of misinformation out there.
The thing is, people who are so adamant about the US being "founded as a Christian nation" (which I firmly believe it was not, from quite a bit of reading on the matter from books and documents written by the various forefathers) have no idea why there should be a separation in the first place. It's there to protect THEM as well. To refrain other religions or non-religious factions from infringing on their rights.. Just imagine if islam swept through and took over, how would the Christian populace feel then?
Anyway, hardly worth arguing about as no internet debate on the matter will change the mind of anybody. What it really takes is the initiative to read and study history.