Mormon God Can’t Keep Promises
D&C 62:6, 9; “Behold, I, the Lord, have brought you together that the promise might be fulfilled, that the faithful among you should be preserved and rejoice together in the land of Missouri. I, the Lord, promise the faithful and cannot lie. Behold, the kingdom is yours. And behold, and lo, I am with the faithful always. Even so. Amen.”
Prophecy given August 13, 1831. History of the Church 1:205-206.
The faithful weren’t preserved – in fact they were kicked out of Missouri. Always remember, it only takes one false prophecy to prove a prophet wrong – Deut. 18:20-22.