Why don't they move Christmas to July, when the stores aren't so crowded?

Our current holiday problem started when Constantine decided that a holiday celebrating the birth of Jesus would be just the thing to make himself look good on The O'Reilly Factor. There was, however, one small problem: no one knew when Jesus was born. The Gospels simply say that the birth occurred when Quirinius was the governor of Syria. This might have been enough information in the hands of a competent archivist to pinpoint a likely date, but competent archivists were hard to find in ancient Rome due to the Roman mob's insatiable appetite for watching overweight, middle-aged clerical types with 2.7 kids and a mortgage try to stab each other to death with quill pens in the Coliseum.

Constantine, having no solid information to work with, asked the Senate and the people of Rome what they thought of July 15th as the date for Christmas. The Senate and the people of Rome, mindful of the fact that Constantine had the bad habit of feeding people who disagreed with him to lions and tigers and bears, oh my, for the entertainment of the people in the cheap seats, told Constantine that July 15th was a wonderful idea. Roman retailers, on the other hand, mindful of losing the 4th of July and Bastille Day sales, told him that while his idea was wonderful, it would be even more wonderful at some other time of the year. One clever gent who owned a shoe store on the Appian Way suggested, after giving the matter some thought, that the Emperor make December 25th the date for his new holiday.

Then someone, possibly the shoemaker who first suggested the idea of the 25th, or maybe his brother — no one could really tell them apart — told the Emperor something that emperors, as a class, love to hear: he was emperor, therefore he could put the holiday anywhere he felt like putting it. And so he did, on the 25th day of December, the high burden of historical and theological proof bending slightly in deference to Constantine's need for campaign contributions.