We believe in Christ. It would be stupid to name a church after someone who we don't believe in. That is a common misconception about mormons. We don't practice plural marriage either...
Christ is the main part of our religion. If you ever get the chance to read the Book of Mormon you can see how many times it talks about him and no we do not worship Joseph Smith or any other prophets I think the Book of Mormon mentions Joseph Smith once.
Thanks guys.