Unity
It has been an objection to the Truth of Christianity that many denominations and doctrinal opinions exist in professing Christian world. Christians, in the minds of many people, cannot seem to unite under a common message and tradition. Now this is exaggerated because Christians do have quite a lot in common, such as belief in the historical accounts of Jesus and the important doctrines and practices that come from those stories.
But this does bring up a sad fact: the Church for the past five hundred years has swallowed the "Protestant" doctrine of interpreting Scripture the way the individual feels should be interpreted and the notion that the "true/loving church" must consist of people of common attributes or denominational orthodoxy. The result has been schisms, departures, and even heresies. There are many other reasons of course but this is what flies through mostly unchallenged in many Christian circles. But we need not despair over the prominence of this phenomenon because God gave us in His word the means to reunite the Church throughout the world and within our area.