Except that being Christian only means accepting Christ as the Son of God and Savior and seeking salvation through his atonement. So Catholics, Protestants, and Mormons all count as Christian groups no matter what one has authority or what one is actually correct (ie: a living branch rather than a dead one). The problem you talk about simply doesn’t exist for us. You guys seem to be the ones having trouble wrapping your head around it.
That is true.
But the MORMON 'christ' is a false one; made up from demonic suggestions.