Not Everyone Will Be Mormon
A common misconception about the Millennium is that everyone will be a member of The Church of Jesus Christ of Latter-Day Saints, but this is not true.
At Christ’s Second Coming, all of the wicked people will be destroyed from off the face of the earth, but many good people of other faiths and ideologies will remain. Aside from temple work, the other great work of the Millennium will be missionary work.
Those living during the Millennium will still have their agency to believe and practice religion as they please. Robert Millet writes, “Seeing is not often believing . . . just as noble and upright souls in all nations and climes hesitate in our day to partake of the glories of the new and everlasting covenant, so also will many decline the fullness of the gospel light in that day when the mediator of the new covenant presides among his Saints.”
Missionary work, however, might be a little different. Since Christ will “reign personally upon the earth” (Articles of Faith 1:10) all peoples of the earth will come to know who He is. It says in the Gospel Principles manual chapter 45 that “Eventually there will be no need to teach others the first principles of the gospel because ‘they shall all know me, from the least of them unto the greatest of them, saith the Lord’ (Jeremiah 31:34).”
Despite differences in belief, everyone will live in peace and harmony during the Millennium, and all will be subject to Christ’s rule. President Taylor taught, “Every nation under the heavens will have to acknowledge his authority, and bow to his scepter . . . [those] who may not yield full obedience to his laws, nor be fully instructed in his covenants will, nevertheless, have to yield full obedience to his government” (Gospel Principles, ch. 45).