Let's not forget the historical document which really kindled the flames for "division":
Luther's 95 Theses, obviously for good reasons. An interesting detail about Luther's 95 Theses is, he did not intend on leaving the Catholic Church, the points of disagreement were meant to be discussed and debated, because he had become something of a Bible scholar, he knew Scripture, and found within the Church at that time many things which were contrary to teachings in Scripture, and so he questioned the Church authorities at the time, and when asked to recant replied:
"Since then Your Majesty and your lordships desire a simple reply, I will answer without horns and without teeth.
Unless I am convinced by sacred Scripture or by evident reason - I do not accept the authority of popes and councils, for they have contradicted each other - my conscience is held captive by the word of God. I cannot and I will not recant anything, for to act against conscience is neither right nor safe. Here I stand! I can do no other. God help me! Amen."
The invention of the printing press years before around 1436-1439 revolutionized Christianity. Someone other than Luther, had taken the theses that he nailed to the Church door, and printed copies which spread like wildfire. Also a good study of the history of the English Bible reveals that before the Reformation, and the printing press, only Bible scholars and Church officials had access to the Scriptures, and if the Church in Rome, had her way, the Scriptures would still be in Latin and out of laymen's hands! It was not without much resistance and bloodshed that we have an English Bible, including the Catholic version. People who think that division is not of God or the will of God, are clearly wrong. Christ Himself said that he did not come to bring peace but a sword, referring to divisions within family.