Wow you have a really scary and inaccuarate view of the LDS Church.
I was raised in the church but left around the time I left my parent's house, because I don't believe it's true.
As to whether Mormons are Christians, it's a pretty complex subject:
http://en.wikipedia.org/wiki/Mormonism_and_Christianity
Nobody really understands LDS people, missionaries are a perfect example, nobody gets the kind of extreme pressure/duress that these poor boys are under to go on missions for 2 years. Half the kids are out just so that their parents won't disown them and their extended family won't constantly gossip in hushed shocked tones about how he must have committed a really SERIOUS sin to be unworthy of a mission. These poor kids are pressured and guilted far beyond what they're ready to handle at such a young age. I'd say more than half aren't there because they're so devout and excited about their religion, but instead are there because of the crazy extreme pressure placed on them by everyone in their entire world that they have to go or else nobody will ever love them again. Girls in Utah won't date you if you aren't a returned missionary, your whole church will gossip about you, friends will distance themselves, and some parents even disown you. Under that kind of pressure, they'd rather just go through the motions than let their entire world collapse.
But they are miserable. Be the one person that day who responds to them warmly and cares if they are hungry or tired or thirsty, even if you aren't interested in the message.
If anybody has questions, I can give a pretty accurate and non-biased view.
I agree with everybody else though, I don't see it as any different from any other religion that I also think is untrue.