Most dangerously, we see it in the way that religion is used to justify the murder of innocents by those who have distorted and defiled the great religion of Islam, and who attacked my country from Afghanistan. These extremists are not the first to kill in the name of God; the cruelties of the Crusades are amply recorded. But they remind us that no Holy War can ever be a just  war. For if you truly believe that you are carrying out divine will, then there is no need for restraint - no need to spare the pregnant mother, or the medic, or even a person of one's own faith. Such a warped view of religion is not just incompatible with the concept of peace, but the purpose of faith - for the one rule that lies at the heart of every major religion is that we do unto others as we would have them do unto us.