‘Why Have Ye Polluted the Holy Church of God?’ 2,500 years ago, Nephi cautioned those living in our day against being “lulled away into carnal security,” believing “all is well in Zion” and putting our trust in the precepts of any men rather than the Holy Ghost. A thousand years later, Moroni reiterated these concerns, focusing on the theme of polluted churches and asking “Why have ye polluted the Holy Church of God?” This paper examines the views of various Mormon scholars on the question, “What is this ‘Holy Church of God’“ and of what importance is it to Latter-day Saints today?