The student body of Lakewood High School, a public school, took a vote. By a vast majority, they voted to conduct a student-led prayer over the public address system of their football stadium before the kick-off of each home game. They elected Paul, the student-body president, to conduct the non-denominational prayer. Jane, an atheist, objected. She was neither required to participate, nor punished for refusing. Nonetheless, Jane believes the public prayer itself to be unconstitutional. What protection(s) and amendments) are involved?