noun, often attributive

Definition of cult

1 : a religion regarded as unorthodox or spurious. (Evangelism)

2a : great devotion to a person, idea, object, movement, or work (Trump,fascism,KKK,Neo-Nazi)

b : the object of such devotion
c : a usually small group of people characterized by such devotion (MAGA, ProudBoys)

3 : a system of religious beliefs and ritual.

4 : formal religious veneration.

5 : a system for the cure of disease based on dogma set forth by its promulgator health cults

Here is a very comprehensive list of cult attributes.