All too many Muslims fail to grasp Islam, which teaches one to be lenient towards others and to understand their value systems, knowing that these are tolerated by Islam as a religion.
If 'god' is a metaphysical term, then it cannot be even probable that a god exists. For to say that 'God exists' is to make a metaphysical utterance which cannot be either true or false. And by the same criterion, no sentence which purports to describe the nature of a transcendent god can possess any literal significance.
Each religious sect has its own physiognomy. The Methodists have acquired a face; the Quakers, a face; the nuns, a face. An Englishman will pick out a dissenter by his manners.
If everyone will try to understand the core of his own religion and adhere to it, and will not allow false teachers to dictate to him, there will be no room left for quarrelling.