Before deciding whether we are Christians, you really should define Christian. Can you list those beliefs, practices, and characteristics that distinguish those who are Christians from those who are not?
The problem of definition is more difficult than it might appear at first. Almost any definition that would exclude Mormons would also exclude other groups that have historically been considered Christian.
You might start with the Bible. The word Christian appears in three places in the Bible: Acts 11:26; Acts 26:28; and 1 Peter 4:16. How does the Bible define the word?
A Christian accepts that the god of the Jews is God, that he had a son named Jesus Christ, who was crucified, that Mary was an eternal virgin and was, along with Jesus, the only person on Earth to have never sinned. Those are the basic beliefs.
Externally speaking, a Christian is a person who has been baptized with water using the trinitarian formula, and can unreservedly confess the historic creeds of the church (Apostles’, Nicene, and the Athanasian). Their lives are also marked by an attention to the commandments of Christ.
One off the top of my head would be: "Does God the Father have a body?"Is this body a separate "body" from Jesus?
Mormons say yes."Orthodox" Christians say no.
I repeat myself again: Each can call themselves whatever they wish, however LDS and "other" Christians are sufficiently different to be two different religions.
They may fight over who is properly "Christian", but both cannot be confused for the same religion. Whatever one is, the other is not. Each holds the other as apostate.
with respect...