I do have kids, they have just finished the public school system. I have been going to their concerts for over ten years. The music represented over the years has included rock, jazz, blues, country, classical, gospel, and traditional type hymns.
My children have had friends who had no problem praying quietly before lunch. Some bowed their heads before tests. A few brought Bibles to read on lunch hour. GASP...a few even read them together. Students and teacher regularly wear cross jewelry or WWJD bracelets and tee shirts.
The only discrimination I ever heard of in our school system was one particular teacher that use to assume everyone in her classes was Xian..even with my openly Wiccan daughter and her openly Jewish friend sitting right in the front row. My daughter has been hassled for wearing her Wiccan goddess symbol necklace by students wearing cross jewelry.
Don't presume to think that your anecdotal experiences are the norm and that your opponents couldn't possibly have had any differing experiences.