sectarianism

noun

1. 1

   Rigid adherence to a particular sect, denomination, ideology, or party.

   “They were discussing sectarianism between Shias and Sunnis.”

2. 2

   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.”