How is believing in Jesus different from believing in Santa Clause?
Santa doesn't have a book, we cannot call on Santa to hear us, he doesn't make himself known throughout history, he doesn't appeal to us in every-way and show us that he is god. Santa is just someone who gives presents to good children, everyone knows Santa isn't real apart from some children, who parents blind them on purpose. There are millions that can verify that God is real, and have seen visions of him, etc.