They are trying to shave a few points in popularity by making some Christians believe that if they support the President they are falling into a nest of unbelievers.
There have been several posts to me from pseudo-conservatives hinting that I "worship" Bush. You have seen them as well.
Of course, my answer is "Piffle!" but that isn't the point. The point is to get a few naive people to panic that perhaps, just maybe, they have chosen unwisely, and at the very least get them to stay home from the polls.