sectarianism

noun

1. (countable, uncountable)Rigid adherence to a particular sect, denomination, ideology, or party.

   “They were discussing sectarianism between Shias and Sunnis.”

   “Our conversation is in French, since he downplays his ability to speak English “out of sectarianism”.”

2. (countable, uncountable)A political system in which power is shared among religious sects based on a constitutional formula distributing public offices among these sects.

   “In Lebanese sectarianism, one half of the members of parliament are Christians and the other half are Muslims.”