Yes, it is strange that many do not consider us Christians especially since our name is The Church of Jesus Christ of Latter-day Saint. We follow the original "Christian" beliefs. We believe that there is one God of this world -- Jesus Christ. He created the world and reveled his teachings to righteous people-- Adam, Noah, Abraham and the other prophets, that He came to teach people how to live and died for our sins, and that he will come again someday in glory. He did all these things under the direction of His Father. We believe that these teachings (the Gospel) were restored in our day through the Prophet Joseph Smith.
We are not Protestants. We are not protesting against the Catholic church leaders. We believe in direct personal revelation from God and that He leads His Church-- not men. Many Christians do not consider these beliefs "Christian". Many view the people of Moses time as "primitive" and the Gospel teachings of love were only known when Christ preached them during his ministry. The consider the God of the Old Testament as different from Christ in the New Testament.