That’s true...but do you believe that Jesus is the Son of God, that he was sent to us to save us from our sins, and that he died on the cross for that effort?
Do you believe that He is the ONLY Son of God?
If so, that would make you a Christian.
If not...
A Christian is one who has confessed with the mouth and IS BELIEVING/faithing in their heart/their soul, that God has raised Him from the dead, to transform them individually in soul with the indwelling presence of His Holy Spirit. Faith is an action word, where the Christian is (as in ongoing, not just once then ignore) offering self for transforming by His Spirit by the renewing of the mind. Being a Christian is a process not just a profession, proving again that He is Lord and creating new creatures 'in Christ Jesus'.
The substance of Christian disagreement with Mormonism is the issue of Mormons proclaiming salvation 'can come' to the individual 'after all that the individual can do' as if a balance sheet to earn the right to God's Grace. Jesus individually and through the scriptures teaches that 'Salvation cometh by hearing and hearing by the word of God.' Salvation is an instant birth in spirit and a life process of Holy Spirit transforming work of the soul, the only works 'in the soul of the individual' that God has foreordained that we should walk in.
Yes I do agree that Jesus is the only Son of God.