I once again defer to The Mighty Fred:
"In the United States, though, we see something very different: an aggressive hostility to religion, a desire to extirpate it and, though no one quite says this, to punish its practitioners. A curious witch-hunt continues in which people seem to look for any trace of religion so that they can root it out. I would call it vengeful, except that I do not know for what it might be revenge.
Why? The explanations given do not make sense. A store whose sign says Merry Christmas is a threat to nothing, just as a nativity scene can offend only one who is looking very hard for something to offend him.
The notion that the Ten Commandments on the wall of a courthouse will lead to an established religion is palpable nonsense. Constitutional piety doesnt wash either. If nativity scenes contravene the Constitution, why was this not noticed by anyone, assuredly including the authors, until at least 1950?
But this does not answer the question of why the hostile stalking of religion that pervades the ranks of the educated and influential in the United States....so far as I know, only communism and Americanism have tried to
eradicate religion."
http://www.lewrockwell.com/reed/reed88.html