Indeed, the birth of Jesus Christ, which we celebrate on Christmas, is mentioned in the Bible. The Gospel of Luke in the New Testament describes the miraculous events surrounding Jesus' birth and the shepherds, wise men, and angels who were present at that time. The Gospel of Matthew also describes the birth of Jesus, including the story of the wise men and their gifts of gold, frankincense, and myrrh. So, Christmas is definitely a part of Christian tradition and is based on the biblical accounts of Jesus' birth.