Jehovah's Witnesses are a Christian denomination that does not believe in celebrating Christmas. They see it as a holiday that has become too commercialized and materialistic, and they believe that it is not in line with their religious beliefs. They prefer to focus on their own religious observances, such as going door to door to share their beliefs with others. They also believe that celebrating the birth of Jesus is a personal matter that should be done privately, rather than through a large celebration.