Everything went well until you got to Joseph Smith. That just about ends it as far as true Christianity goes. History proves that Smith was not a prophet and you know what God does to false prophets.
Actually, history shows the opposite. I would start with the prophecies about the civil war given by Joseph Smith 20 years before it started. Then move on to others.
Here’s a start for ya.
http://www.jefflindsay.com/LDSFAQ/FQ_prophecies.shtml
Other than Mormon what other faiths are viewed as in error? I mean surely it can’t be just the Mormons. I know there are some on fr that detest the Catholic faith. So how many other faiths are in error?