Secularism, I submit, is above all a negation of worship. I stress:—not of God’s existence, not of some kind of transcendence and therefore of some kind of religion. If secularism in theological terms is a heresy, it is primarily a heresy about man. It is the negation of man as a worshiping being, as homo adorans: the one for whom worship is the essential act which both “posits” his humanity and fulfills it.
Alexander Schmemann, For the Life of the World, Appendix 1