Romans 5:6-9 (KJV)
6 For when we were yet without strength, in due time Christ died for the ungodly.
7 For scarcely for a righteous man will one die: yet peradventure for a good man some would even dare to die.
8 But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us.
9 Much more then, being now justified by his blood, we shall be saved from wrath through him.
Mormons Are Unsaved: False Atonement
A big reason why Mormons are unsaved is because of their beliefs in a false atonement. This one belief is damning them to hell.