If it was a christian nation, or meant to be a christian nation, the founders would have spelled it out in the constitution and established a religion. Yes there are references to god in documents like the declaration of independence. That's just so they could get it through the kings thick skull.
I think I liked it better when the various christian sects were warring with each other. Now that they have set aside enough differences they can band together and call this a 'christian country', we have to deal with distractions like these.