The active point here is that this monument was built long before the current interpretation of the 1st amendment was made. Based on your argument, all the monuments and memorials in DC should be sold to private citizens, along with almost every courthouse or government building in this country. Explain to me how honoring the God whose principles provided the impetus for the founding of this country is wrong, whether you believe in Him or not. If the Bible were purely fiction, it would still be a document worthy of at least the respect given the Magna Carta just because it is the basis of all the laws observed in the free world.