It doesn’t matter what someone believes about God unless it is what is in the Scriptures. God revels Himself to ALL individuals, not groups (Romans Ch1—no one is without excuse...).
Mormons are not Christians because they do not have faith that Jesus is the Savior. Only individuals who believe that Jesus is the Savior are Christians.
And you have to believe in Jesus for who He really is. You cannot make up another Jesus, believe in it and have God bless you into His Kingdom.
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Mar 13:21 And then if any man shall say to you, Lo, here [is] Christ; or, lo, [he is] there; believe [him] not:
Mar 13:22 For false Christs and false prophets shall rise, and shall shew signs and wonders, to seduce, if [it were] possible, even the elect.