Michael Gerson, conservative columnist and former speechwriter for President George W. Bush writes on a disturbing trend among "Tea Party" activists: the belief that America is, or should be, a Christian nation. He sets them straight:
This was particularly evident in the patriotic piety of Glenn Beck's "return to God" rally on the Mall. It was civil religion revivalism. There was little evidence of racism or a longing for white privilege. But there was plenty of nostalgia for an idealized past in which government was smaller, social ties were stronger, and America was a Christian country.
This view is comforting to some — as comforting as a visit to Colonial Williamsburg. It is consistent with populist movements before it. But it is flawed nonetheless. America is not a Christian country and has never been, for historical, theological and philosophic reasons.
For elaboration on those reasons, read the whole thing.