1) Denominationalism 2) Narrow-mindedness 3) Narrowness 1) Denominationalism 
Sectarianism, according to one definition, is bigotry, discrimination, or hatred arising from attaching importance to perceived differences between subdivisions within a group, such as between different denominations of a religion, class, regional or factions of a political movement. The ideological underpinnings of attitudes and behaviours labell...
• (n.) 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.
(from the article `Christianity`) ...commonwealth or society. This development stimulates opposition from those who understand the Gospel in terms of personal commitment and ... While unity is given in Christ, two diametric forces appear in the history of the church. One is the tendency toward sectarianism and division; the ... ...Th...
Treating people unfairly because they belong to a certain religious group - i.e. Catholic people might treat Protestant people unfairly just because of their religious beliefs (and vice versa).
Sec·ta'ri·an·ism noun 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. 
[n] - a narrow-minded adherence to a particular sect or party or denomination
denominationalism noun a narrow-minded adherence to a particular sect or party or denomination; `he condemned religious sectarianism`