 The plaintiffs claimed evolutionary theory endorsed a secularist religious view, and argued the school's failure to incorporate the teaching of a particular religious alternative to evolutionary theory as derived from the Bible's creation account held that religious view up to ridicule and contempt.To allow evolution while avoiding creationism was unconstitutional, the suit claimed, because it advanced one particular sectarian view over another.The plaintiffs maintained that the school's evolutionary teaching constituted "the establishment of a sectarian, atheistic religion" and was an interference of their own rights to the free exercise of religion as guaranteed by the Establishment clause in the First Amendment to the Constitution of the United States.