When I was in school we all said the Lords Prayer

Even worse is that religion causes tribalism. Which together has inflicted violence on people at all levels not just in schools but wars between countries and many regional conflicts throughout history. It continues to do so to this day.

We said it too. I'd never heard it before I got to school. Actually kind of liked it. Never heard of anyone getting punished. I had a friend who used to stand quietly. He said he didn't believe in God but understood others liked their rituals.