Ecclesia Gnostica Catholica (E.G.C.), or the Gnostic Catholic Church, is the ecclesiastical arm of the O.T.O (Ordo Templi Orientis). The E.G.C. is a Thelemic religious organization, dedicated to the advancement of Light, Life, Love, and Liberty through alignment with the law of Thelema. The central ritual of the E.G.C. is Liber XV, The Gnostic Mass. It was composed by Crowley for O.T.O. and E.G.C. in 1913. Bubastis Oasis presents this ritual publicly on a regular basis. Check our calendar for dates, or join our Yahoo group. Ecclesia Gnostica Catholica is an inseparable part of Ordo Templi Orientis, and the Gnostic Mass is one of the official rituals, more specifically the central ritual, of Ordo Templi Orientis. The Book of the Law , the central Text of Thelema, is an integral part of E.G.C., and all are urged to study this text.

In addition to Presentations of Liber XV, Bubastis performs E.G.C. Baptisms, and Confirmations.