I think Dave Berry says it best:

Posted by Kromey at 3:28pm Apr 20 '10
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In the old days, it was not called the Holiday Season; the Christians called it 'Christmas' and went to church; the Jews called it 'Hanukka' and went to synagogue; the atheists went to parties and drank. People passing each other on the street would say 'Merry Christmas!' or 'Happy Hanukka!' or (to the atheists) 'Look out for the wall!' -- Dave Berry