Caught up in the Protestant revivalism of his day, Smith inquired as to which of the Christian denominations he should join. None of them, he was told, because they were all wrong. “The Personage who addressed me said that all their creeds were an abomination in his sight,” Smith later recalled.
Smith was urged to take heart. God would use him to reinstate the true church, which had fallen into complete apostasy after the death of the apostles.
The Church of Jesus Christ of Latter-day Saints professes to be the restored true church. Its leaders claim that Joseph Smith faithfully rediscovered proper church organization – that is, the Aaronic and Melchizedek priesthoods – and the true gospel, which was lost due to “designing priests” that removed its “plain and precious” truths.
In short, the LDS Church declares itself the one true church, while all other forms of Christianity remain apostate.