Matt Yglesias says he feels sympathy for Christians who feel that Christmas has been weakened by meaning so much to so many different groups. I on the other hand feel no such sympathy. Christmas only exists on Dec 25 in an attempt by the Catholic church to take over the pagan holidays celebrating the Winter Solstice. Most scholars pin Christ's birthday somewhere in September.
In other words the entire point of Christmas for the Catholic church was to muddy the waters and take over the celebrations of other religions. I feel no sympathy that this policy has come back to bite Christianity.