Hmmm... well the fallacy of that position is what if I join another denomination? Do I then lose my salvation?
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If you were LDS? Then yes, definitely. Apostates (like me) are the only ones other than those who followed Lucifer after the war in heaven to be cast into their version of Hell called “Outer Darkness”.
Once you join the LDS, leaving and joining another denom is a rejection of Mormonism, the “true” gospel, Joseph Smith and Christ.
It is a one way ticket to Outer Darkness.
If you were never LDS, Baptist then became Presbyterian, it doesn’t matter to the LDS b/c you are ignorant of “true” Christianity. You are just moving from one apostate group to another.
That is the dumbest thing I have ever heard, at least today.
God’s promise of salvation is inviolable. Least that is what he had some old guys write.