The simple answer to this question really involves acknowledging how the fall of man has caused even Christians to pursue a system of labeling themselves to the point of sectarianism and exclusionary tendencies. Inherent within our sin nature is an urge to puff ourselves up as having the "only correct interpretation." Some denominationalism arises from a desire to distinguish ourselves according to a certain heritage such as the African American civil rights movement or some other significant historical event that drove people to their faith, but most denominations came about in an attempt to distinguish a certain doctrinal position that a certain church held to. The primary issue with denominationalism is not that different church communities have a different interpretation of the "negotiable doctrines," it's that we tend to slap labels on ourselves which can lead to sectarian divisiveness and lack of overall unity in the body of Christ. The true Churc...
Expanding your knowledge of Scripture simply, and practically.