Now, to answer Regret's question at the beginning of the thread: Why aren't Mormon considered "true" Christians? (Please correct me if any of this is incorrect.)
1. The Book of Mormon is not part of the Bible.
2. There is historical evidence suggesting that Smith and his early followers had involvements with things generally deemed "occultic."
3. Smith's ability to translate the text was based on his use of a "seer stone" placed into a hat, which he then put to his face--which is occultic in nature.
4. Smith lied to his followers about receiving the Book of Mormon from an angel--at least, he may have. Letters unearthed from one of his early disciples claim that he obtained it from a "magical white salamander" that transformed itself into a spirit. (Now, this is a bit of a tangent, and I have not thought upon it thoroughly, but a salamander and a serpent are not so different, especially if they both speak.)
5. It is taught that men and women can become gods/goddesses and will be worshiped by others if they achieve this status.
6. It is taught that Yahweh was once a man who became God.
7. It is taught that the Holy Spirit is a spirit in the form of a man.
8. Baptism for the dead is practiced (a misinterpretation of Paul's writing in 1 Corinthians).
9. "As man is, God once was; as God is, man may be."