In all fairness, we don’t know Romney’s heart and we don’t know his belief in Christ.
BUT we can look at the religion he follows and proclaim that the LDS Church is NOT a Christian religion. Just as we can look at the followers of Islam and proclaim in unChrisian. This is not hateful.....it simply is truth. At least Islam is not trying to hijack Christianity like Mormonism is, by using the same words with different meanings to deceive the very elect.
Matthew 24:24 For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if [it were] possible, they shall deceive the very elect.
We can also look at the church you follow and proclaim that it is not a Christian Religion!