Where Did Christmas Come From?
World Scope Encyclopedia (1960 vol.3) states, "Christmas, the festival observed by the Christian Church on the 25th day of December in commemoration of the birth of Jesus Christ. No certain knowledge of the birthday of Jesus Christ exists and its observance was not established until some time after the organization of the first churches. The 25th day of December was advocated by Julius 1, Bishop of Rome from 337 to 352, as the most suitable time to commemorate the birth of Christ. The day was finally placed on December 25th, which made it possible for all nations to observe a festival of rejoicing that the shortest day of the year has passed. The end of December was an especially significant time in the northern hemisphere. Days were short; nights long. The sun was at its lowest point. This called for the celebration of special festivals of thanksgiving and encouragement to the waning sun. When at the winter solstice in late December, the days began to lengthen once again, there was great festivity lasting into the first part of January. The reason was that the declining sun---the light of the world--had been reborn and began to gain in strength. Moreover, the newly converted peoples found it convenient to get a kind of substitute for their original celebrations of the solstice ". The birth of Jesus the Christ was assigned the date of December 25th, because on this day, as the sun began its return to the northern skies, the pagan devotees of Mithra (the Persian's Sun God) celebrated the dies natalis Solis Invicti (birthday of the invincible sun).
The history book a Pictorial History of the Italian People states, "Saint Gregory was repelled by Graeco-Roman civilization and, paradoxically, did more than anyone else to facilitate the absorption of pagan residues into Italian Christianity. Through that process of absorption, any paganism hostile to Christianity remaining in Italian rural communities faded away".
The simple fact is that, as more and more people from throughout the Western Roman Empire became converted to an increasingly popular Christianity, they brought many of their favorite customs with them. "The pagan [winter festivals of the] Saturnalia and Brumalia were too deeply entrenched in popular custom to be set aside by Christian influence... The pagan festival with its riot and merrymaking was so popular that Christians were glad of an excuse to continue its celebration with little change in spirit or in manner... Christians of Mesopotamia accused their western brethren of idolatry and sun-worship for adopting as Christian this pagan festival. Yet the festival rapidly gained acceptance and became at last so firmly entrenched that even the Protestant revolution of the sixteenth century was not able to dislodge it..." (The New Schaff-Herzog Encyclopedia of Religious Knowledge, Volume III, article "Christmas.") You see this going on in churches today. Churches are constantly recruiting new members from other denominations and they often bring some aspect of their previous church to the new one. If you notice, many Christians today celebrate the Roman Catholic tradition of Lent. Historically, Lent, was not celebrated by Protestant churches.