Encyclopedia Britannica, 1946 edition, has this: "Christmas (i.e., the Mass of Christ) .... Christmas was not among the earliest festivals of the church ...."It was not instituted by Christ or the apostles, or by Bible authority. It was picked up afterward from paganism. The Encyclopedia Americana, 1944 edition, says: "Christmas .... It was, according to many authorities, not celebrated in the first centuries of the Christian church, as the Christian usage in general was to celebrate the death of remarkable persons rather than their birth ...." (The "Communion," which is instituted by New Testament Bible authority, is a memorial of the death of Christ.) "... A feast was established in memory of this event [Christ's birth] in the fourth century. In the fifth century the Western Church ordered it to be celebrated forever on the day of the old Roman feast of the birth of Sol, as no certain knowledge of the day of Christ's birth existed."
The Plain Truth About Christmas