If I have said it once, I have said it a thousand times. It’s not enough to have faith in Jesus. We must have faith in the RIGHT Jesus. The Jesus of Mormonism, Islam, Kingdom Hall, Christian Science etc, is not the RIGHT Jesus. Their Jesus, is a fake Jesus, who does not exist, and many will be dragged into hell, believing in a fake Jesus.
The Apstle Paul speaks of such a situation in 2 Cor. 11:3-4:
But I fear, lest by any means, as the serpent beguiled Eve through his subtilty, so your minds should be corrupted from the simplicity that is in Christ. For if he that cometh preacheth another* Jesus, whom we have not preached, or if ye receive another"" spirit, which ye have not received, or another"" gospel, which ye have not accepted, ye might well bear with him.Another Jesus of the same kind is one that saves only through a church, or by water baptism; or whose salvation is incomplete and depends on whether or not you can keep it, or whose mother had no other children.
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Notes:
* = ἄλλος = another of the same kind
** = ἕτερος = another of a different kind
Another Jesus of a different kind is a Jesus whose brother is Satan, or one who is a god but not The God and is of the same substance as and a manifestation of the Triune Godhead.
A gospel of a different kind is, for instance, a narrative in which you have to earn your way to heaven, or one in which after you have been saved, you can lose it by not keeping on "believing" or not being good; or that there is a second chance after physical death.
And there all kinds of spirits that are not the Holy Ghost that guides the true children of God, but directs their attention elsewhere, or gives you more scripture to rely on more than the canons of the Old and New Testaments.
At least, that is the way I have been taught and see the situation.