This paper traces historical and contemporary cases in which courts have ruled on matters about U.S. public schools and the boundaries of religious interference. The U.S. Constitution has neither adopted an official religion nor established a separation of church and state, thereby endorsing a secular legal ethos. However, schools have historically been public spaces for contention, testing such boundaries. A discussion of the impact of rulings and their practical implementation is contextualized to demonstrate that secularism and religion are not binary opposites. Secularism serves to protect both laicism and religion; thus, it has prompted murky interpretations and the need for legal interventions, which have shifted at times depending on the context.