The American storyteller Garrison Keillor recently claimed that you don't have to believe in Jesus to have a great Christmas. Keillor said,

Although you may decide that instead of Christmas carols you are going to hold hands and breathe in unison, Christmas will still live deep in the cockles of your heart—or actually in your neo-cortex, stored as zillions of neuron impulses … It's [your brain] that sends tears to your eyes when you smell the saffron cookies that your grandma used to make or you sing Silent Night. So Christmas is: number one lights, number two food, number three song, number four being with people you like. You need no more.

Tim Keller comments on Keillor's quote:

Keillor is saying that it doesn't matter whether you believe in God or not. You can still hold hands, you can still breathe in unison. All the good feelings of Christmas are just a reaction in our brain. But here's why that doesn't work. I know enough about Garrison Keillor to know that he is very upset with cruelty and prejudice. But if it's really true that there is no God, if there is no supernatural or miracles, and if everything is a function of natural causes—if that is all true, then it is also true that love, and joy, and even cruelty and prejudice are just all chemical reactions stored in our brain. Keillor is against cruelty and prejudice, but if it's true that everything is just chemistry, then how in the world can you say there's a moral difference between love and cruelty, between kissing someone or killing someone? They're both nothing but neuro-chemical responses. So if there is no God, and if Christmas is all about lights, songs, and being with nice people and your neo-cortex going crazy about it, then I don't see how Keillor can stand up and say that there is something wrong with cruelty and prejudice. He can't do it. Without the theology behind Christmas, you lose the core meaning of Christmas.