God just told Moses that He (God) is Jehovah; He is self-existent, self-sufficient, eternal, and unchangeable. It couldn’t be clearer that He is not a created being, but the Creator Himself. He did not spring from man’s loins as we did. The Mormon Church fuels itself on their theory of “The Law of Eternal Progression”. For them this means God is ever increasing in receiving glory from all the beings he created which don’t necessarily all live here on this planet. He did this after living on an earth like ours and earning the right to become a god. For the Mormon, this is true salvation.
The other problem with this whole scenario is who they believe God is. For the Mormon, Jehovah is the pre-existent Jesus, not God. However, we plainly see in Exodus here of no hint that the Godhead is made up of 3 different gods or that only Jesus is Jehovah.
Journal of Discourses, vol. 1, pg. 123 says; “Remember that God, our Heavenly Father, was perhaps once a child, and mortal like we ourselves and rose step by step in the scale of progress, in the school of advancement; has moved forward and overcome, until He has arrived at the point where He now is.” – Orson Hyde, Salt Lake City, October 6, 1853