David S. Reynolds says that Mormons are Protestant. I’ve never heard Mormons called Protestant before. Mormons don’t consider themselves Protestant.
Some people say that Mormons are "Restorationist," but I say that Mormonism is a new religion, because an angel gave Joseph Smith gold tablets which, after translated from ancient Egyptian, tell the real truth, some of which contradicts what Protestant Christians and Catholics believe. I would say that Mormonism is to Christianity as Christianity is to Judaism.