Wherever the Book of Mormon came from it states something that neither Satan will (until the last day when everyone will be forced to) and that most Christians don't know and which the Bible says can only be revealed by the Holy Spirit and to only those who love God;

All things are delivered to me of my Father: and no man knoweth who the Son is, but the Father; and who the Father is, but the Son, and he to whom the Son will reveal him.
(Luke 10:22, Matthew 11:27)

And that is WHO God IS - Jesus Christ.