I've always had problems with the definition of nationalist and its now almost universal substitution for patriot anyway.
Almost by definition most patriots in this nation are going to be Christian just because in order to BE a patriot one must put others before oneself . . . the realities of Mom, Flag, and Apple-pie -- so to speak -- and that concept appears to be increasingly alien to the collective political Left, whom now seem to be rejecting both patriotism and Christianity.