What was the significance of the Lemon test established by the U.S. Supreme Court in Lemon v. Kurtzman? Click or tap a choice to answer the question. The Lemon test was the first time that the Supreme Court ruled against prayer in public schools. The Lemon test helps guide the Supreme Court in determining whether a case of religious freedom invokes the free exercise clause or the establishment clause of the Constitution. The Lemon test significantly expanded what was covered by religious freedom, granting protections to nonbelievers and Muslims. The Lemon test helps the Courts in determining when government aid to religious schools would be constitutional