The Mormon church spends millions and millions of tithing dollars every year building temples. They believe that doing baptisms and temple sealings will bring salvation for the dead. They do not understand their own scriptural teachings:
Moroni Chapter 8
22 For behold that all little children are alive in Christ, and also all they that are without the law. For the power of redemption cometh on all them that have no law; wherefore, he that is not condemned, or he that is under no condemnation, cannot repent; and unto such baptism availeth nothing—
23 But it is mockery before god, denying the mercies of Christ, and the power of his Holy spirit, and putting trust in dead works.