What I want to know is what these "values" are that the United States is based off that they share with Christianity and ONLY Christianity.
Quite vague, is it not?
Although Wardogg has made at least a couple of interesting arguments, I think the important point is that the religious right attempts to forcibly impose its own artificial and pathetic version of religion upon others when the founding laws of the United States clearly provide for a multi-cultural society which is a phenomenon that also has historical precedent.
Aside from the traditions of British, French, and american political activists like the English Levellers, the Jacobins, and the Anti-Federalists, the Ottoman Empire, for example, was renown for its tolerance providing freedom of faith for Christians, muslims, and jews. Certain elements of the agenda of the american religious right are reminiscent of the vehement nationalism and aggressive religious politics imbibed by some peoples in the final years of the Ottoman Empire after these same peoples had hitherto harmoniously lived together for centuries. I think the american civil rights movement (and its predecessors) did produce some semblance of such common goodwill which the post-war conservative movement including the american religious right has generally tended to minimize if not destroy.
As far as I am concerned, the British ancestors of the founders of america were heretics who had abandoned the Church by circa 1066 A.D. when England severed communion with Constantinople. Thus, both the masonic american founders and the religious right are heretics, and I therefore view the american system as essentially non-Christian just as the Ottoman Empire. A reference to the Holy Trinity in the Treaty of Paris in 1782 and the reference to the God of nature in the Declaration of Independence or plaques of the Ten Commandments in courtrooms are facades which obscure the fact that the United States was never Christian at any time. The removal of such nominal signs of Christianity is indeed apostasy, but it is logical and expected for an essentially agnostically founded and oriented society.