sec·tar·i·an 
(sĕk-târē-ən)
(sĕk-târē-ən)adj.
1. Of, relating to, or characteristic of a sect.
2. Adhering or confined to the dogmatic limits of a sect or denomination; partisan.
3. Narrow-minded; parochial.
n.
1. A member of a sect.
2. One characterized by bigoted adherence to a factional viewpoint.
sec·tari·an·ism n.