The nation was not founded in Christianity. It was more founded on pagan ideas. The pledge of allegiance did not contain the words "one nation under god". Those words were later added in 1954. America is the land of the free, not home of the enslaved by religion. We have the right to be a patriot without being religious. Religion is a personal thing, so stop trying to shove it down everyone's throats. And stop telling everyone who does not agree with you to leave America. If you have an issue with them, how about you leave and go somewhere where your personal views are supported elsewhere?
I am at home, where my freedom of speech shall not be infringed upon, where no government can tell me what to say, where I'm not dictated by a religious system that forces its beliefs upon me.
Separation of church and state is a JOKE; gays can't get married, abortion is still illegal (yet the death penalty still exists) and god is still a thing in public schools.
Mind you, I understand things are progressing an getting better but one should never be forced to conform to another's ideals.