I think there's just a wee bit more than that to Christianity. Mormons only claim that Jesus is the son of God, but they don't believe that Jesus is the Lord our God, God Incarnate, (which is exactly what the Apostle Thomas said to Jesus as he fell upon his knees in full realization that Jesus is indeed God, - "my Lord and my God" ~ John 20:28 ). Mormons believe Jesus is merely a man, a non-deity, just a flesh and blood man and nothing more. They also believe that His second coming has already taken place, but that nobody noticed Him, so He just decided to go back to Heaven and chill out. Mormons are about as "Christian" as Muslims are.
As a Mormon I believe in Jesus Christ as my Lord and Saviour — my only one. We’re looking forward to His second coming (hasn’t happened yet)