The following is a good word from John MacAruthur:
Christmas as a holiday was not observed until well after the biblical era. The early church of the New Testament celebrated Jesus’ resurrection, but not His birth. In fact, Christmas was not given any kind of official recognition by the church until the mid-fifth century.
Partly because so many Christmas customs seem to have their roots in paganism, Christians have often been resistant to some of the rituals of the holiday. The Puritans in early America rejected Christmas celebrations altogether. They deliberately worked on December 25 to show their distain. A law passed in England in 1644 reflected a similar Puritan influence; the law made Christmas Day an official working day. For a time in England it was literally illegal to cook plum pudding or mince pie for the holidays.
Christians today are generally not opposed to celebrating Christmas. The holiday itself is nothing, observing it is not a question of right of wrong. As Paul wrote, “One man regards one day above another, another regards everyday alike. Let each man be fully convinced in his own mind. He who observes the day, observes it for the Lord, and he who eats, does so for the Lord, for he gives thanks to God; and he who eats not for the Lord he does not eat, and gives thanks to God (Romans 14:5-6). Everyday–including Christmas–is a celebration for us who know and love Him.
How we observe Christmas is the central issue. Do we observe it for the Lord’s sake or for our own sinful self-gratification? Do we even think about why and how we celebrate it? That is the heart of the matter. Christmas is an opportunity for us to exalt Jesus Christ. We ought to take advantage of it.
– from God With Us: The Miracle of Christmas