I wish schools teach more about this than Abe Lincoln is anti-slavery (he's not, he's a free soiler)

Public institutions (i.e., a school system) cannot require prayer.

Lawrence Roth, an avowed atheist, objected that the Long Island, New York School System was forcing his two children to recite a 22 word prayer at the beginning of the day. There were actually four other parents involved in the suit against school board president William Vitale, Jr. The Supreme Court ruled that although the prayer was nonsectarian and noncompulsory, “it is no part the business of government to compose official prayers.” Because New York provided the prayer, it indirectly approved religion and that was unconstitutional.