The Baphomet became an important figure within the cosmology of Thelema, the mystical system established by Aleister Crowley in the early twentieth century. Baphomet features in the Creed of the Gnostic Catholic Church recited by the congregation in The Gnostic Mass, in the sentence: "And I believe in the Serpent and the Lion, Mystery of Mystery, in His name BAPHOMET." In Magick (Book 4), Crowley asserted that Baphomet was a divine androgyne and "the hieroglyph of arcane perfection": The Devil does not exist. It is a false name invented by the Black Brothers to imply a Unity in their ignorant muddle of dispersions. A devil who had unity would be a God... 'The Devil' is, historically, the God of any people that one personally dislikes... This serpent, SATAN, is not the enemy of Man, but He who made Gods of our race, knowing Good and Evil; He bade 'Know Thyself!' and taught Initiation. He is 'The Devil' of the Book of Thoth, and His emblem is BAPHOMET, the Androgyne who is the hieroglyph of arcane perfection... He is therefore Life, and Love. But moreover his letter is ayin, the Eye, so that he is Light; and his Zodiacal image is Capricornus, that leaping goat whose attribute is Liberty.
For Crowley, Baphomet is further a representative of the spiritual nature of the spermatozoa while also being symbolic of the "magical child" produced as a result of sex magic. As such, Baphomet represents the Union of Opposites, especially as mystically personified in Chaos and Babalon combined and biologically manifested with the sperm and egg united in the zygote. Crowley proposed that Baphomet was derived from "Father Mithras". In his Confessions he describes the circumstances that led to this etymology:I had taken the name Baphomet as my motto in the O.T.O. For six years and more I had tried to discover the proper way to spell this name. I knew that it must have eight letters, and also that the numerical and literal correspondences must be such as to express the meaning of the name in such a ways as to confirm what scholarship had found out about it, and also to clear up those problems which archaeologists had so far failed to solve ... One theory of the name is that it represents the words βαφὴ μήτεος, the baptism of wisdom; another, that it is a corruption of a title meaning "Father Mithras". Needless to say, the suffix R supported the latter theory. I added up the word as spelt by the Wizard. It totalled 729. This number had never appeared in my Cabbalistic working and therefore meant nothing to me. It however justified itself as being the cube of nine. The word κηφας, the mystic title given by Christ to Peter as the cornerstone of the Church, has this same value. So far, the Wizard had shown great qualities! He had cleared up the etymological problem and shown why the Templars should have given the name Baphomet to their so-called idol. Baphomet was Father Mithras, the cubical stone which was the corner of the Temple.