Is it constitutional to teach about religion in a public school?
Yes. In the 1960s school-prayer cases that prompted rulings against state-sponsored school prayer and devotional Bible reading, the U.S. Supreme Court indicated that public school education may include teaching about religion. In Abington v. Schempp, Associate Justice Tom Clark wrote for the Court:
“[I]t might well be said that one’s education is not complete without a study of comparative religion or the history of religion and its relationship to the advancement of civilization. It certainly may be said that the Bible is worthy of study for its literary and historic qualities. Nothing we have said here indicates that such study of the Bible or of religion, when presented objectively as part of a secular program of education, may not be effected consistently with the First Amendment.”