1 John 4
1. Dear friends, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world.
2. This is how you can recognize the Spirit of God: Every spirit that acknowledges that Jesus Christ has come in the flesh is from God,
3. but every spirit that does not acknowledge Jesus is not from God. This is the spirit of the antichrist, which you have heard is coming and even now is already in the world.”
Let’s not forget “and by their fruits shall ye know them.”
Mormons have our fair share of idiots, fools, and charlatans, but so do all other churches. It’s part of the human condition. I’m blessed that I knew good Baptists, as well as my step-father, else I’d have concluded that all Baptists were like him. And even he wasn’t all bad, just bad enough to hurt.
But you guys have the only TRUE Church. You guys have the fullness of the gospel. The rest of us, well AFAIC have an excuse, we don't know any better, we are sinners.