Reason! Lol! Everything about Mormonism is unreasonable, illogical, unprovable, and totally unsupported by archeology. Take Smith's Book of Abraham for instance. He bought an old papyrus scroll and claimed he translated it and was all about Abraham. But any fool who studied Ancient Egypt can easily tell that the scroll a piece of the Book of the Dead. I studied Ancient Egypt in elementary school and I could tell that easy as pie. It shows the embalming process and the judgment of the soul before Osiris.
And if J. Smith couldn't be trusted in his 'translations' in that account, why should anybody trust anything he ever said? This is not even to mention Smith's false prophecies (example: his claim that the second coming would be in 1891). Everything is against Smith. The evidence indicates that he was a conman.
You need to look here. You are being misled as is obvious by your worn out propaganda.
Heres a few links to get your started from a different viewpoint. I have found that the vast majority of the issues brought up in the anti-Mormon propaganda can be found and addressed at http://www.fairlds.org/ but heres more:
http://scriptures.lds.org/
http://www.lds.org
http://www.fairlds.org/
http://www.mormonapologetics.org/
http://www.mormonwiki.com/Main_Page
http://www.lightplanet.com/response/index.html
http://www.jefflindsay.com/LDS_Intro.shtml
http://www.answeringantimormons.com/index.htm
http://promormon.blogspot.com/
Have a great night! Study and pray!