I am embarrassed to say, that, yes, I was arrogant enough to think, and then teach on my mission, that the LDS church was the one and only true church on the face of the Earth. I want to apologize to all those people I baptized in Argentina for having lied to them. [shudder!]
This is what every church says. There are plenty of well-to-do theists out there that have different beliefs and believe that their church is the only right one. It doesn't add up when your church says they're the only true church. Either every other church is lying to their believers, or your church is lying to you.