http://www.cnn.com/2015/07/02/living/america-christian-nation/
You are going to post an article to CNN to prove your point to a man in his 50's who was a history major, who has spent most of his adult life reading history, political science, philosophy and theology for fun?
Who in this thread said America was founded as a Christian nation? You are setting up a straw man. All you are doing is regurgitating propaganda designed to ease your conscious over your antipathy toward Christianity.
Having said that, our founders actually believed in truth, that reality could be known and discovered. They believed in inalienable rights and natural law as something that existed and could be discovered. Enlightenment thought is much closer to where I'm at than where modern society is at philosophically (some tangent off of post modernism).
Considering that enlightenment thought was based upon an understanding of Aquinas and a whole host of other Christian thinkers as well as the Greek classics the very idea of contrasting them as being as oppositional as this article does is basically revisionist propaganda ignoring the full continuum of thought at the time.
Our founders were very very much "cultural Christians", it was the water they swam in and took for granted.
By the way, separation of church and state is as much a new world Christian idea as it is enlightenment. Try reading up on Roger Williams a bit and his influence on the founders.
http://www.smithsonianmag.com/history/god-government-and-roger-williams-big-idea-6291280/?no-ist