Contrary to popular misunderstanding, the U.S. Supreme Court never "banned prayer in public school." Instead, the justices forbade politicians and school officials to tell students when, where or how to pray (or whether to pray at all). Instruction about religion is the task of parents, not government officials.
MORE: https://www.au.org/blogs/wall-of-separation/never-mind-emily-litella-joins-nc-church-learns-about-school-prayer