The Announcement of the Universal Apostasy.
It is a most startling announcement with which the Prophet Joseph Smith begins his message to the world. Concerning the question, he asked God--"Which of all the sects is right, and which shall I join?" he says:
HISTORY
of the CHURCH OF JESUS CHRIST
of LATTER-DAY SAINTS

The secret Mormon prophecy known as "Daniel's Prophecy of the Rise of the Kingdom of God in the last Days" teaches that Mormons are not Christians at all, they will vanquish Christianity and convert American into their own Mormon kingdom of Zion. Further, this same Mormon theology is still taught by the "mainstream" Utah Mormons even today and is still considered canon by the Utah Mormon religion today.

The Mormon prophet's, Joseph Smith, radical Mormon theology called the "Doctrine of Cain" taught that slavery was a divine institution, that "the Jews" were the product of an illegitimate union between the Devil and Cain, that all of the dark-skinned people of the world were the product of the illegitimate union between "the Jews" and the Devil, and that the Government of the United States should be overthrown because "Christianity" and the Judeo-Christian Laws of America
Joseph Smith’s secret Mormon “Doctrine of Cain” and Today’s “Two-Seeds Doctrine”
The Mormon Wars and Joseph Smith's 1831 "9/11" Prophecy