There's nothing to believe or not believe in. Historically, Santa Claus is/was a real person. Whether you choose to believe in Santa Claus is something you'll have to decide on your own. According to Wikipedia: "Santa Claus is a variation of a Dutch folk tale based on the historical figure Saint Nicholas, a bishop from Turkey (then known as Myra), who gave presents to the poor. His charity became legend when a man lost his fortune and found himself incapable of supporting his three daughters, who would not be able to find husbands as they lacked dowries. This man was going to give them over to a life of prostitution; however, St. Nicholas provided them with gold and cookies, enabling them to retain their virginal virtues and marry." So, there really was a Saint Nicholas (whom we call Santa Claus now) and he really did give gifts. So like I said in the beginning, you can't choose to believe he wasn't a real figure in history when he was. Though you can choose to decide if he has any meaning to you today.