He who observes the day, observes it to the Lord.
The Puritans in early America rejected Christmas celebrations altogether. They deliberately worked on December 25 to show their disdain. 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, and observing it is not a question of right or wrong. As Paul wrote, “One man regards one day above another, another regards every day 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” (Rom. 14:5–6). Every day—including Christmas—is a celebration for us who know and love Him.