Someone did say they will become a god when they die, but that seemed like they meant to say Angel.
Personally, I suspect the definition that counts is that of Jesus. Lacking direct revelation from him to me on the subject, I give all those who claim to be Christians the benefit of the doubt. If Jesus disagrees with their claim, we'll all find out in due course.
The official teaching of the church is that Jesus and Lucifer are/were spirit brothers, equal in stature, before Lucifer got ticked and left heaven. And, I do understand that they believe they will become gods when they die, with their very own planet, and a spirit-spouse to populate it with spirit-children. (Please - no flames. I'm just paraphrasing to make it quick...)
And YES - although I do not align with the Mormons, I DO think the Naval Officer was a jerk, if the story related is accurate.
Yes.
... and HE is one part of the TRINITY?
No, because we believe the "Trinity" is an erroneous construct from the Middle Ages. However, we believe that Jesus Christ is Jehovah of the Old Testament, and that He is one member of the GODHEAD, which includes God the Father, Christ Himself and the Holy Spirit.
If so, that would make them Christian.
In the end, labels mean nothing except as they inform us, or pander to our ignorance. In the end God Himself judges, and the judgements of man are irrelevant.
(In orthodox Christianity, anyway........)
(I have been reading:>)