Carrie Underwood has a single out at the moment called “Love Wins”. It’s one of those anthems that has a catchy tune and is full of noble sentiments—telling us that even though life is terrible at times, a day is coming when love will win, so we should reach out and care for each other. Well, you can’t disagree with that. It almost sounds Christian, although she makes no mention of God. But my question is, how can you be sure love will win?

The reason I ask is because the prevailing belief sys...