Osirism (formally known as the Cult of Osiris) is a mystery religion that encompasses the sacred Mysteries of Osiris as its core rites and rituals. An Osirian (mystic belonging to Osiris) seeks to have a mystical union with Osiris by adhering to ma’at (cosmic order, truth, morality) so that the soul may be vindicated on judgment day and live eternally in paradise. 

The decline of the Cult of Osiris began with the spread of Christianity in Egypt from the 3rd century CE onward. Christian theology offered its own doctrine of resurrection, judgment, and salvation, effectively fulfilling the spiritual roles once held by Osirian belief. Imperial edicts in the late Roman period further accelerated this transition, leading to the closure of ancient temples. By the 6th century CE the Cult of Osiris went completely underground and ceased to exist. The Master of the Mysteries 𓃣, Mosiah Mensah (Ancient Egyptian: 𓄟𓋴𓇋𓂝𓎛𓇹 𓏠𓈖𓋴𓄿𓎛𓇼 “Child of the Moon and Eternal as Orion”) has resurrected the Cult of Osiris as Osirism.