Mormonism and Christanity are both Abrahamic religions. Historically, although Mormons consider themselves to be Christians, Mormonism has had an uneasy relationship with traditional Christianity such as the Roman Catholic Church, Eastern Orthodox Church, and most branches of Protestantism. This is primarily due to the fact that adherents to Mormonism claim that the movement is a "restoration" of the earliest Christian and Judaic doctrines.
"Take up the Bible, compare the religion of the Latter-day Saints with it and see if it will stand the test" (Brigham Young, May 18, 1873, Journal of Discourses, vol. 16, p. 46.)
Following is a comparison between Christian doctrine and Mormon doctrine. It will become very obvious that Mormonism does not agree with the Bible. In fact, Mormonism has simply used the same words found in Christianity and redefined them. But with a proper understanding of what Mormonism really teaches, you will be able to see past those definitions into the real differences between Christianity and Mormonism. The difference is the difference between eternal life and damnation. http://carm.org/comparison-between-christian-doctrine-and-mormon-doctrine