Yeah, I hate that. When people find out I'm not Christian and make it their mission to save my soul. I haven't known any Mormons since I was 12, so I don't really have an opinon on that, and have had very few encounters with Jehovah's witnesses. We once had one show up at our house when I was little *waaaaaaaaaaay out in the boonies!!!* and my foster mother was just like, "Have a cookie, now go away."
But I've never had any Jews or Muslims try and tell me that my religion was wrong. Its only Christians. And certainly not all of them *or I'd be short quite a few friends right now!* but the ones that DO irritate the hell out of me. Especially if they know I was raised Christian, because its like, I've been there, done that, and it wasn't right for me! Respect that!