More Protestant Christians than not think that Mormons are Christians. But all you have to do is study Mormonism a little bit to see their radically different views. God the father was once a mortal man. God had a god that he worshipped. Jesus was “sired” by god the father. Jesus is literally the brother of Lucifer, as well as you and me. Jesus did not create everything. Our spirits pre-existed this life. We can become gods of our own world. Polygamy is possible in the afterlife. And on and on and on.
Why do so many Christians think Mormons are Christians? Either they don’t know Mormonism or they don’t know Christianity. Or maybe it’s both. So it’s not surprising to see these kinds of statistics. But it does speak of the dire need to train our people.