We Christians do not define/describe God the same way the Mormons do. The Christian God is Triune, only the Son is flesh and blood (since the incarnation) , etc. The Mormon God is defined/described differently.
(For the sake of this discussion, the assumption is that the Christian defined/described God is the one true God.)
So are the Mormons wrong about God OR are they worshiping the wrong God?
Does God view them as confused followers or as idolators?
When a Mormon prays does God ignore them because they are "talking to someone else" or, does God think, "Bless their hearts, they are wrong about me but I forgive them and will hear and answer their prayer anyway?"
When proseletyzing, are Mormons simply misrepresenting God or are they leading people away from the one true God and toward a false god?