Al Mohler writes:
Mormonism does not claim to be just another denomination of Christianity. To the contrary, the central claim of Mormonism is that Christianity was corrupt and incomplete until the restoration of the faith with the advent of the Latter-Day Saints and their scripture, The Book of Mormon. Thus, it is just a matter of intellectual honesty to take Joseph Smith, the founder of Mormonism, at his word when he claimed that true Christianity did not exist from the time of the Apostles until the reestablishment of the Aaronic and Melchizedek priesthoods on May 15, 1829.
From a Christian perspective, Mormonism is a new religion, complete with its own scripture, its own priesthood, its own rituals, and its own teachings. Most importantly, those teachings are a repudiation of historic Christian orthodoxy — and were claimed to be so from the moment of Mormonism’s founding forward. Mormonism rejects orthodox Christianity as the very argument for its own existence, and it clearly identifies historic Christianity as a false faith.
Mormonism starts with an understanding of God that rejects both monotheism and the Christian doctrine of the Trinity. The Mormon concept of God includes many gods, not one. Furthermore, Mormonism teaches that we are now what God once was and are becoming what He now is. This is in direct conflict with historic Christianity.
Mormonism rejects the Bible as the sole and sufficient authority for the faith, and insists that The Book of Mormon and other authoritative Latter-Day Saints writings constitute God’s final revelation. Furthermore, the authority in Mormonism is mediated through a human priesthood, through whom God is claimed to speak directly and authoritatively to the church. Nothing makes the distinction between Mormonism and historic Christianity more clear than the experience of reading The Book of Mormon. The very subtitle of The Book of Mormon — Another Testament of Jesus Christ — makes one of Mormonism’s central claims directly and candidly: That we need another authority to provide what is lacking in the New Testament...
It is neither slander nor condescension to state clearly that Mormonism is not Christianity. Taking Mormonism on its own terms, one finds a comprehensive set of teachings and doctrines that are self-consciously set against historic Christianity. The larger world may be confused about this, but biblical Christians cannot make this error, for we are certain that the consequences are eternal.
Next, Dr. Mohler addresses whether or not Christians should vote for a Mormon:
It is on this question that Evangelicals must think forcefully, faithfully . . . and fast. We need to recognize that we are asking this question from a privileged historical and political context. For most of our nation’s history, voters have chosen among presidential candidates who were identified, to one degree or another, with some form of Protestant Christianity. To date, for example, America has had only one Roman Catholic president and one Jewish candidate for vice president as a major party nominee.Read on HERE.
It can be argued that our contemporary political context puts greater emphasis on the religious identity of candidates at all levels than has ever been experienced in American history. Both major political parties have sought various elements of the religious electorate and have developed strategies accordingly.