Hostility toward Mormonism has many sources. A religion established in the 19th century has not had the time to establish its teachings as timeless. A religion founded in the United States lacks the exoticism of those more directly connected to the mysterious Middle East. A religion that once allowed randy elders to possess child brides and consigned its young males to oblivion makes the Catholic Church's problems with wayward priests seem like a mere episode of, well, waywardness. A religion whose followers show a pronounced tendency to become CEOs of some of America's largest corporations is bound to arouse envy.
Not least, there is the Book of Mormon itself.