On the topic at hand, if there's one thing I believe about the Constitution and the Bill of Rights is that, with the exception of slavery clauses, the Founding Fathers wrote what they ****ing meant to say and that's that. "No establishment of religion" means "no establishment of religion." Fundies can argue that the country was based on Judeo-Christian values all they'd like, but the law says that no religion will be respected by the government as a religion to base its law off of. The Founding Fathers were smart and looked back in history and saw how well Theocracies had gone over.
Still, the Founding Fathers also said that Congress shall make no law abridging the freedom of speech, and if these Christians want to exercise that by making a Statue of Liberty with a cross in it, then they should be free to do it. Christians can live by the Bible if they like, but their right to exercise religion stops at the point where they begin to infringe on human rights and cross the line too far into politics. The Bible's got plenty of good common sense laws to live by (the 10 Commandments, respecting your neighbor, respecting the government), so I don't see why the Christians all have to flock to the one part of the Bible that says "no homosexuality." Preaching that essentially leads into breaking a whole number of other commands; they disrespect the government's authority by attempting to get legislation such as the homosexuality ban through and hate their neighbors if they're gay.