Why is Religion So Divisive?

A recent survey revealed that many people harbour incredible negative attitudes to religion: 46% of those surveyed said that “religion is a major part of the problem in our world” whilst 42% think it’s not religion per se but “people of faith” who are the problem.

Why are people so down on religion? Why do so many imagine with John Lennon that a world “without religion” would be more peaceful, more tolerant, more inclusive and more harmonious? What’s the problem with religion?