Its because we have so much potential that its a tradegy you restrict yourself to one book. The oldest existing record of a Christmas celebration is found in a Roman almanac that tells of a Christ’s Nativity festival led by the church of Rome in 336 A.D. The precise reason why Christmas came to be celebrated on December 25 remains obscure.  Every winter, Romans honored the pagan god Saturn, the god of agriculture, with a festival that began on December 17 and usually ended on or around December 25 with a winter-solstice celebration in honor of the beginning of the new solar cycle. This festival was a time of merrymaking, and families and friends would exchange gifts. At the same time, Mithraism–worship of the ancient Persian god of light was popular in the Roman army, and the cult held some of its most important rituals on the winter solstice.  Pick up another book and keep on learning!  https://en.wikipedia.org/wiki/Saturnalia