Wicca with the Celtic festival is the name. Gardner himself made use of the English names of these holidays, stating that "the four great Sabbats are Candlemass, May Eve, Lammas, and Halloween; the equinoxes and solstices are celebrated also." In the Egyptologist Margaret Murray's "The Witch-Cult in Western Europe" (1921) and "The God of the Witches" (1933), in which she dealt with what she believed had been a historical Witch-Cult, she stated that the four main festivals had survived Christianisation and had been celebrated in the pagan Witchcraft religion. Subsequently, when Wicca was first developing in the 1930s through to the
Wicca oral teachings passed along to their initiates. There are many variations on the core structure, and the religion grows and evolves over time. It is divided into a number of diverse lineages, sects and denominations, referred to as "traditions", each with its own organisational structure and level of centralisation. Due to its decentralized nature, there is some disagreement over what actually constitutes Wicca. Some traditions, collectively referred to as British Traditional Wicca, strictly follow the initiatory lineage of Gardner and consider the term "Wicca" to apply only to similar traditions, but not to newer, eclectic traditions. Wicca is typically duotheistic,