I find a few things about your post to be slightly misleading, so I've got a couple questions for you to clarify, if you'll indulge me.
First: I understand you say Mormons consider themselves Christians, but if no other Christian denomination does, how is that valid? What I mean is, I can consider myself a Muslim, but if I don't recite the Shahada or follow any of the other required practices of Islam, and also every Muslum sect everywhere says I'm not Muslim, I'm not Muslim. I'm just going around saying I am. Isn't it more likely that Mormons say they are Christian is to make their recruitment efforts more palatable to a predominately Christian culture?
Second: You say you have the Bible plus the book of Mormon, but if you aren't including Doctrine and Covenants, Pearl of Great Price, and Journal of Discourse, aren't you outside the realm of Orthodox Mormonism? It's from these other books that most actual doctrine is derived, after all.
Third: You say Mormons had multiple wives in the early days "most likely because the women drastically outnumbered the men," but isn't it more likely that the reason was because the early church leaders like Brigham Young (Journal of Discourses Vol 11, pg 269, 11:239, 13:165-166) and Joseph Smith (Doctrine and Covenants 132:4) taught polygamy as divine revelation? Isn't it more likely that these men, like all men who gain power and then take multiple wives, were instead using their influence to satisfy their sexual appetites, and the Mormon Church eventually rejected the practice because of the high social cost of its continuation?
Thanks for your time.
RE: I'm a mormon so I'll clear up some common myths about us