Quotes from The Reason for God by Timothy Keller:

“Skeptics believe that any exclusive claims to a superior knowledge of spiritual reality cannot be true. But this objection is itself a religious belief. It assumes God is unknowable, or that God is loving but not wrathful, or that God is an impersonal force rather than a person who speaks in Scripture. All are unprovable faith assumptions… It is no more narrow to claim that one religion is right than to claim that one way to think about all religions is right. We are all exclusive in our believes about religion, but in different ways.”

“Why would such an exclusive belief system lead to behaviour that was so open to others? It was because Christians had within their belief system the strongest possible resource for practicing sacrificial service, generosity, and peace-making. At the very heart of their view of reality was a man who died for his enemies, praying for their forgiveness. Reflection on this could only lead to a radically different way of dealing with those who were different from them.”