Why does the Pope hate Christmas?

Fox News has a new "War on Christmas" Grinch.

It's Christmas, but not as you know it: a new book released this week by Pope Benedict XVI looks at the early life of Jesus -- and debunks several myths about how the Nativity unfolded.  

 In "Jesus of Nazareth -- The Infancy Narratives," the pope says the Christian calendar is actually based on a blunder by a sixth century monk, who Benedict says was several years off in his calculation of Jesus' birth date. 

(h/t Ponds)