On Thursday, the Supreme Court in American Legion et. al. v. American Humanist Association, decided that the Bladensburg Peace Cross, which was erected nearly 100 years ago and has stood on public land in Maryland for roughly 50 years, does not violate the Establishment Clause. This decision should be celebrated, but the reasoning that the Court used does not entirely protect religious monuments or other displays in the future. Seven of the justices decided that the Cross does not violate the Establishment Clause of the First Amendment. However, this was a plurality decision, which means there was not a majority...