From BibleStrength

Christmas can't be anti-Biblical, because it's not mentioned in the Bible, right? Wrong.

Actually it is mentioned in the Bible, in Jeremiah 10:2-5.

This is a not particularly subtle reference to the song, "Deck the Halls", written thousands of years earlier! Christmas was an Old Testament pagan tradition where trees were chopped down, fastened with nails and hammers so they wouldn't move, decked with silver and gold, and considered a "custom." We are specifically commanded not to learn this way of the heathen.