The Jehovah's Witnesses are a Christian denomination that has its roots in the late 19th century. They do not believe in celebrating Christmas because they believe it is a pagan holiday that has been corrupted by the commercialization and secularization of the modern era. They believe that celebrating Christmas goes against the teachings of the Bible and the example of Jesus, who did not celebrate his own birthday. Instead, they encourage their members to focus on their personal relationship with God and to avoid any celebrations or practices that might conflict with their beliefs.