Mormonism teaches that God used to be a man on another world and that we can become gods, but in order to achieve this, you must be an LDS member.
Joseph Smith, the founder of Mormonism, said a lot of very "interesting" things about God being a man, the Trinity is three gods, temple work, and people on the moon...
The truth is found in the Bible, the inspired word of God. Mormonism is not Christian since it teaches a different God, a different Christ, and a different gospel.