What my discussions with the Lds in particular have taught me is that Islam, Lds, the New Age, JW etc. all have the same issue.
An angel or a vision or something else convinced them that Jesus is different to the Jesus of the Bible. Either not god, or god but of the same essence as man, or a god but one of many etc.
The disagreements are always the same. The important change is in who Jesus is.
But the truth is Jesus is the very Word of God made flesh. Only God is able to die for us and suffer His own wrath and prevail. Only Jesus can save. He is "the way, the truth and the life"