When a British scholar called on the world’s religions to work together for worldwide unity, people everywhere applauded. Pointing out that the major religions share a belief in the Golden Rule, she suggested, “The chief task of our time is to build a global society where people of all persuasions can live together in peace and harmony.”

Jesus cited the Golden Rule in His Sermon on the Mount: “Do to others what you would have them do to you” (Matt. 7:12). In the same sermon, He said, “Love your enemies and pray for those who persecute you” (5:44). Putting those radical…