The Santa Delusion: Why 'Religion Is Useful' Is a Terrible Argument For Religion
"But religion is useful. It makes people happy. It comforts people in hard times. It makes people better-behaved. And losing religious faith can be traumatic. So what difference does it make if it isn't true? Shouldn't we be perpetuating it anyway -- or at least leaving it alone? Why do you want to persuade people out of it?" More here.