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Religion and occultism

Several contemporary religions have been influenced by Lovecraft's works. Kenneth Grant, the founder of the Typhonian Order, incorporated the Cthulhu Mythos into his ritual and occult system. Grant combined his interest in Lovecraft's fiction with his adherence to Aleister Crowley 's Thelema. The Typhonian Order considers Lovecraftian entities to be symbols through which people may interact with something inhuman. Grant also argued that Crowley himself was influenced by Lovecraft's writings, particularly in the naming of characters in The Book of the Law. Similarly, The Satanic Rituals, co-written by Anton LaVey and Michael A. Aquino, includes the "Ceremony of the Nine Angles", which is a ritual that was influenced by the descriptions in "The Dreams in the Witch House". It contains invocations of several of Lovecraft's fictional gods.

There have been several books that have claimed to be an authentic edition of Lovecraft's Necronomicon. The Simon Necronomicon is one such example. It was written by an unknown figure who identified themselves as "Simon". Peter Levenda, an occult author who has written about the Necronomicon, claims that he and "Simon" came across a hidden Greek translation of the grimoire while looking through a collection of antiquities at a New York bookstore during the 1960s or 1970s. This book was claimed to have borne the seal of the Necronomicon. Levenda went on to claim that Lovecraft had access to this purported scroll. A textual analysis has determined that the contents of this book were derived from multiple documents that discuss Mesopotamian myth and magic. The finding of a magical text by monks is also a common theme in the history of grimoires. It has been suggested that Levenda is the true author of the Simon Necronomicon.