Much of that "under god" stuff was pushed through at various times in the twentieth century by zealots in the house and senate. The Pledge of Allegiance is a good example. It was written something over 100 years ago as a publicity stunt and the words "under god" weren't there until 50 years ago. There was an anniversary lately. It has never been put to any meaningful vote or referendum before it was adopted or edited. I am always careful to omit "under god" on the few occasions I can actually be persuaded to stand up with a group of people and have to appear to mouth the thing. I consider the whole pledge an imposition, frankly, and the references to the god of the dominant political parties an affront.

Here and here are a couple of links to some history of it.

SRS