Plus the divisions among Christians is really a scandal that hurts the witnessing for both Jesus and the good news of the Gospel.
Schisms, factions and divisions are inevitable in any organization that grows above a very small number of individuals. It in mans nature to form factions and alliances.
Religions act much as political parties. Think of the American Revolution. Once the external threat of England had dissipated the former revolutionaries formed opposing parties. One favored a strong central government the other favored a weak central government.
If you are looking for scandal look here:
This meeting also demonstrates the importance the pope gives to the Islamic world. After resolving the issues between Christians, the new pope might take action to engage in dialogue with the Islamic world, Özşahin said.
There can be no dialog with the Islamic world. How do you dialog with an entity whose dearest wish is to cut your throat?