not a Christian nation
"...one of the great strengths of the United States is, although as I mentioned we have a very large Christian population, we do not consider ourselves a Christian nation or a Jewish nation or a Muslim nation. We consider ourselves a nation of citizens who are bound by ideals and a set of values."
See this video, just after the 3:30 mark:
Christianist revisionists are no doubt already complaining about secularist bogeymen, but they should familiarize themselves with some historical facts about our founding. Let's start with the Treaty of Tripoli, which is especially relevant here:
As the government of the United States of America is not in any sense founded on the Christian Religion,- as it has in itself no character of enmity against the laws, religion or tranquility of Musselmen [Muslims],- and as the said States never have entered into any war or act of hostility against any Mehomitan [Muslim] nation, it is declared by the parties that no pretext arising from religious opinions shall ever produce an interruption of the harmony existing between the two countries.