On the most fundamental issue, traditional Christians believe in the Trinity: that God is the Father, the Son and the Holy Spirit all rolled into one.
Mormons reject this as a non-biblical creed that emerged in the fourth and fifth centuries. They believe that God the Father and Jesus are separate physical beings, and that God has a wife whom they call Heavenly Mother.
It is not only evangelical Christians who object to these ideas.
“That’s just not Christian,” said the Rev. Serene Jones, president of Union Theological Seminary, a liberal Protestant seminary in New York City. “God and Jesus are not separate physical beings. That would be anathema. At the end of the day, all the other stuff doesn’t matter except the divinity of Jesus.”