It's fairly common knowledge for anyone who knows the slightest thing about Mormonism.
I'm surprised you don't know that Mormons teach that Jesus and Satan were brothers if you are a Mormon.
You, my jump-to-conclusions friend, are the only one who said or implied I was a Mormon. On the other hand, I have known many Mormons, having grown up in upstate New York near the home of Joseph Smith. When I read your post, I simply went to the Mormon web site and clicked on a link where they reiterated that Christ was the son of God. That may not be Christian enough for you but it’s good enough for me.