Have you started the campaign to start tearing down Congress and the Supreme Court buildings yet? How about the Lincoln Memorial? Those are public buildings that have the word God on them. Shouldn't we act now to destroy those buildings that our founders built?
Just because something has the word God in it does not mean it promotes or respects the establisment of religen.
However if it is a motto, it does. If its a part of a overall historical or otherwise artistic display, I dont think that means it necessarly promotes the establisment of religen.