Only one of them follows all the principles laid out in the Bible. To name a few: Prophets, Apostles, Revelation, Scripture, Authority by the laying on of hands by those in authority, etc., etc.
Oh, so I guess the fifty thousand 19 year old LDS boys and girls out there walking around alone preaching the Gospel to people who hate them makes them more like men than anyone here. I was one of them. I've been stoned, spit on, kicked out of homes and churches, shot at and stabbed at (dude didn't know how to handle a knife) solely because I wore a certain kind of name tag. Does that count as the "real world"? Is that close enough to John 15:18-27 or does it not count because we don't have a disinterested third party? Those that aren't for us are against us, I believe Christ said. Disinterested third party doesn't really fit in there.