<P> Following these two cases came the Court's decision in Lemon v. Kurtzman (1971), a ruling that established the Lemon test for religious activities within schools . The Lemon test states that, in order to be constitutional under the Establishment Clause, any practice sponsored within state - run schools (or other public state - sponsored activities) must adhere to the following three criteria: </P> <Ol> <Li> Have a secular purpose; </Li> <Li> Must neither advance nor inhibit religion; and </Li> <Li> Must not result in an excessive entanglement between government and religion . </Li> </Ol> <Li> Have a secular purpose; </Li> <Li> Must neither advance nor inhibit religion; and </Li>

When did religion in schools become an issue