Honorable Kalbe Ali,
Why Hindus, Christians do not fight and only Muslim fight each other?
Well the answer is easy! Hindus trust each other sects as simply a different way towards common destination. In fact, they probably also believe that every religion people are crying for the same goal. Whatever differentiate them is worldly.
Christians used to fiercely fight and kill each other in the name of belief. But after the enlightenment movements, as it is called, some hundreds of years back they have become more philosophical than religious. Some have gone atheists; some agnostics and others do not care much about each other’s religion. Today, they don’t even allow religion in schools nor mention their religion in passport.
But this is not the case with Muslims. Ask every shades of Moulvis and they will tell.