sectarian, sectary, sectarist -- (a member of a sect; "most sectarians are intolerant of the views of any other sect")
Overview of adj sectarian
The adj sectarian has 2 senses
sectarian -- (of or relating to or characteristic of a sect or sects; "sectarian differences")
sectarian -- (belonging to or characteristic of a sect; "a sectarian mind"; "the negations of sectarian ideology"- Sidney Hook; "sectarian squabbles in psychology")