canadianspankee:
If you look up the origins of the celebration of Christmas it will tell of the early origins were certainly of pagan origins.
That's actually a myth: most scholars nowadays believe the Christmas date was set because of an old Jewish tradition that a prophet dies on the anniversary of his conception (which would have been March 25).
Here you can read more about this:
http://www.biblicalarchaeology.org/daily/biblical-topics/new-testament/how-december-2 5-became-christmas/The Orthodox Church also celebrates on December 25, but in the old Julian calendar (which corresponds to January 7 in our modern Gregorian calendar).