You either allow all the materials from FALSE RELIGIONS or you allow no religious material at all. They chose right, as there is no use promoting all the other false regions in the world, in school, which outnumber (in count) the ONE TRUE RELIGION of Christianity.
We can give the TRUE GOSPEL MESSAGE of CHRISTIANITY ourselves, outside of school!
How did they choose right? “False religion” does not fall under the Free Exercise Clause, being false.