Why don't Muslims put Quran as a reason for unity in place of wars?

Because for Muslims the only thing worse than a non Muslim  is the wrong kind of Muslim.

This is why they cant even get along with each other yet alone the rest of the world

I heard the Quran is really four books and which one they follow is the causes of their division and 9/11 God needed an Army and sent planes into a USA building to get USA's Army into teh Mid-east to keep the peace....