Witchcraft is a practical, magical religious philosophy that is Gnostic in essence though not in origin. Its tenets are animism (an inherent soul in all things), and the use of intuitive states to communicate and interact with this soul, often for practical purposes (healing, fertility, success). These states are accessed via poetry, myth, and psychodrama.
Gnosticism is a pre-Christian syncretic religion which combines Roman, Kemetic (Egyptian), Hellenic and Judaic themes and philosophy. Its central tenet is that the liberating experience of knowing oneself profoundly and intuitively - gnosis - is essential in knowing and experiencing the Divine. Its central rite is the Eucharist, which is the manifestation of incarnate Divinity in the form of Mithras/Dionysis, Wasir/Heru (Osiris/Horus) and the Logos/Christ. While much of Gnosticism resembles Christianity aesthetically and structurally (particularly since the Gnostic Revival of the 19th Century), it is an older and distinct religion in its own right.
Thelema is a 20th Century religion drawing from Rabelaisian philosophy ("Do what thou Wilt") and Kemetic aesthetics. Its central document is a prose poem written in a trance state in 1904 by Aleister Crowley. Also Gnostic in essence, Thelema demands its adherents discover their true nature and maintain its integrity in all things. Its central rite is the 1913 Gnostic Mass, a re-envisioning of the Eucharist. Thelema had originally three main organizations: A masonic (some would argue pseudo-Masonic) fraternity, the OTO (which predated Thelema but a majority of Lodges chose to embrace the new religion); a more public Church, the Ecclesia Gnostica Catholica (at least those congregations of the pre-existing EGC which chose to proceed along Thelemic lines) and the A.'.A.'., an initiatory system of meditation and alchemy with a strongly Buddhistic and Kabalistic orientation. (Continues)
.....Wicca was specifically invented by Gardner to popularize Thelemic Gnosticism (specifically the Gnostic Mass).
