sectarianism

noun

The state or character of being sectarian; adherence to a separate religious sect or party; especially, excessive partizan or denominational zeal.

The quality or character of a sectarian; devotion to the interests of a party; excess of partisan or denominational zeal; adherence to a separate church organization.

Rigid adherence to a particular sect, party or denomination.

A narrow-minded adherence to a particular sect or party or denomination.