" The trouble with purging the school curriculum of religious knowledge is that ultimate questions cannot be answered without reference to religious beliefs or at least to philosophy. With religion expelled from the schools, a clear field was left for the entrance of the mode of belief called humanitarianism, or secular humanism--the latter a term employed by the cultural historian Christopher Dawson. During the past four decades and more, the place that religion used to hold in American schooling, always a rather modest and non-dogmatic place, has been filled by secular humanism. Its root principle is that human nature and society may be perfected without the operation of divine grace. . . .

In his book A Common Faith (1934), [John] Dewey advocated his brand of humanism as a religion. "Here are all the elements for a religious faith that shall not be confined to sect, class, or race," he wrote. "Such a faith has always been implicitly the common faith of mankind. It remains to make it explicit and militant."

Much more evidence exists to suggest that humanitarianism, or secular humanism, should be regarded in law as a religion, with respect to both establishment and free exercise in the First Amendment. It is this non-theistic religion, hostile to much of the established morality and many existing American institutions, that has come close to being established as a "civil religion" in American public schools. "

― Russell Kirk , Rights And Duties: Reflections On Our Conservative Constitution