The Trinity is the central doctrine of Christianity. Mormons aren't Trinitarians, and for that reason cannot be considered true Christians.
Catholics, Orthodox and the vast majority of Protestants are Trinitarians.
IIRC United Pentecostals and JW’s are not Trinitarians.
So you believe their were NO Christians for the first several years after the Crucifixion?
You do, of course, know the the doctrine of the Trinity did not come about for decades after?
You do know that Jesus NO WHERE claims to be GOD the Father? (Trinitarians claim that when He said "they all may be one; as thou, Father, art in me, and I in thee" as meaning He was ALSO God, not that He was saying He and God the Father were ONE in mind, in spirit. But the entire scripture reads: "And the glory which thou gavest me I have given them; that they may be one, even as we are one: 23 I in them, and thou in me, that they may be made perfect in one; and that the world may know that thou hast sent me, and hast loved them, as thou hast loved me."
So if you use the trinitarian interpretation module, that would mean we are ALL God and ALL the Christ and ALL the Holy Ghost as, in Jesus' words: "that they may be one, even as we are one: 23 I in them, and thou in me, that they may be made perfect in one;"
I'm not suggesting that you shouldn't believe in the Trinity. I AM saying that you may not have the last word on the subject and that I will take Jesus' word over mans.
A good link, for the brave and seekers of truth...although all anyone has to do is read Jesus's words ONLY to understand the truth.
http://www.heaven.net.nz/writings/trinity-09.htm