cult

(noun) followers of an exclusive system of religious beliefs and practices.

(noun) an interest followed with exaggerated zeal. Synonyms: fad, craze, furor, furore, rage. Examples: "He always follows the latest fads." "It was all the rage that season."

(noun) followers of an unorthodox, extremist, or false religion or sect who often live outside of conventional society under the direction of a charismatic leader.

(noun) a religion or sect that is generally considered to be unorthodox, extremist, or false. Example: "It was a satanic cult."

(noun) a system of religious beliefs and rituals. Synonyms: cultus, religious cult. Example: "Devoted to the cultus of the blessed virgin."