1) Sectarianism 
Denominationalism is the belief that some or all Christian groups are legitimate churches of the same religion regardless of their distinguishing labels, beliefs, and practices. This belief is not accepted by all Christian churches. The Catholic and Orthodox Churches do not use this term as its implication of interchangeability does not agree with...
• (n.) A denominational or class spirit or policy; devotion to the interests of a sect or denomination.
De·nom`i·na'tion·al·ism noun A denominational or class spirit or policy; devotion to the interests of a sect or denomination. 
Denominationalism refers to the subdivision of a particular religion. A common example is Protestant Christianity in the United States, which is subdivided into multiple denominations (e.g., Baptist, Methodist, etc.). For more information, click here.
denominationalism Adherence to or advocacy of certain denominational principles or a denominational system; such as, of education.
denominational or sectarian spirit or policy; the tendency to divide into denominations or sects.