At its core, it's no more or less ridiculous than Christianity, Judaism, Islam, or any other religion.
the bible was written by dozens of people over many centuries - yet it is very deep and entirely cohesive. Joseph Smith, on the other hand, is a testimony of a single person, yet his stuff is weak and doesn't mesh with the bible is MANY areas.
if you can't see that difference, then this thread is useless.
There were actually 4 total witnesses-Joseph Smith, Oliver Cowdery, David Whitmer, and Martin Harris. You sound like a good Christian. You should sincerely pray to god asking him if the church is true. You should also go to Mormon.org, or visit a Mormon Church(visitors are welcomed). If the Missionaries ever knock on your door, let them in. They have a good message.
if you're a real poster this thread is about to get awesome