The Constitution prohibits the passing of laws respecting the establishment of a religion, favoring Christianity is not the same as establishing it as a national religion. Jefferson and Madison had no problem with church services being held in government buildings on Sundays; in fact they even attended services in the Congressional Hall. Itís obvious that their intentions behind the establishment clause had nothing to do with Government favoring Christianity; Christianity is the most culturally influential religion in American history and therefore it should receive more attention for these historical reasons alone much like Judaism should in Israel and Islam in the U.A.E..
OíReilly was right about it being a philosophy but wrong about it not being a religion. However, Silverman was wrong about the constitution prohibiting the government from treating one religion differently from the rest; no such prohibition exists in the constitution. He may not like the government doing that, but that doesnít make it unconstitutional.