Christian belief is that life begins at conception. Mormons believe everyone preexists as angels, and some are born into this world. Thus, those that are saved get to "return".
They also believe "As man is, God once was; as God is, man may become.", to quote fifth LDS President Lorenzo Snow. Joseph Smith even said "Here then is eternal life - to know the only wise and true God; and you have got to learn how to be Gods yourselves, and to be kings and priests to God the same as all Gods have done before you." Brigham Young is quoted saying "The Lord created you and me for the purpose of becoming Gods like Himself."
You could argue these are not mainstream Christian doctrines, but rather are the antithesis of monotheism. Thus, you could argue Romney is not a "Christian".
From the main-stream Christian apostate perspective, you could argue doctrine that way.
But your views on the nature of God are based on old sectarian notions, interpreting Biblical scriptures in a way to fit your own beliefes, not revelation from God to clarify such issues directly.
Your interpretations are in conflict with 20,000 other Christian churchs. THere is quite a variety of opinions among those 20,000.