IPA: /ˈkʌltɪst/
KK: /ˈkʌltɪst/
A person who is a member of a group that has unusual or extreme beliefs, often centered around a particular leader or ideology.
The cultist followed the teachings of their leader without question.
Cultist → It is formed from "cult" (from Latin "cultus", meaning care, cultivation, or worship) and "-ist" (meaning a person who practices or is concerned with something). A cultist is a person who practices or is devoted to a particular cult or system of worship.
Think of someone who is deeply involved in a specific system of worship or care — that's what a cultist is.