The war on Christmas stuff is tedious. The problem is it is reacting to even more tedious nonsense in an inevitable, and probably necessary way.
Depends on how you define that clause. It is clear that the ACLU position, that even the most inexpensive and small shows of acknowledgement of Christianity, like municipal Christmas trees or signs, are prohibited by this clause, is not what those who wrote or ratified it thought it meant. Fisher Ames, was the one who wrote it and he was one of the most conservative of the Founding Fathers. By 1805 he was predicting that democratic liberty would destroy the US as any worthwhile, moral nation. It is unlikely he agreed with the ACLU's position, as his writings on the subject show.Note the very important word "public". Public funds going to finance a religious display is a clear violation of the first amendment establishment clause.