Osirism, also known as the Cult of Osiris is a mystery religion/cult that encompasses the sacred Mysteries of Osiris as its core rites and rituals. An Osirian mystic (initiate of Osirism) seeks to have a mystical union with Osiris (God of fertility and the afterlife) 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 Osirism 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 but has been revived by Mosiah Mensah (Ancient Egyptian: 𓄟𓋴𓇋𓂝𓎛𓇹 𓏠𓈖𓋴𓄿𓎛𓇼 “Child of the Moon and Eternal as Orion”), Master of the Mysteries (𓃣).