sectarian
adjective /sekˈteəriən/
  /sekˈteriən/
 [usually before noun] (often disapproving)- connected with the differences that exist between groups of people who have different religious views
- sectarian attacks/violence
 - attempts to break down the sectarian divide in Northern Ireland
 
Oxford Collocations DictionarySectarian is used with these nouns:- conflict
 - divide
 - division
 - …
 
Word Originmid 17th cent.: from sectary + -an, reinforced by sect.