If you think that having faith that you are saved equals actual salvation you are wrong. The gospel does not teach this in anyway. If it did that would be a works-based theology.
Speaking of works-based theology. According to the Mormon gospel, in 2 Nephi 25:23 in the book of Mormon, we read - "For we labor diligently to write, to persuade our children, and also our brethren, to believe in Christ, and to be reconciled to God; for we know that
it is by grace that we are saved, after all we can do." In other words, "do all you can or else the Lord will not be able to save you."
*IN CONTRAST, in Ephesians 2:8-9 in the Bible, we read - For
by grace you have been saved through faith, and that
not of yourselves; it is the
gift of God, not of works, lest anyone should boast.