I've grown up surrounded by Mormons and a Mormon my almost my entire life, I've moved from Utah a few years ago, and I've grown up being taught about these things since I was almost two. I could see how these things could be hard to believe. I can't tell you anything to prove these but, I can tell you that if you want to find out whether or not they are true, you should try reading, or learning about (the Bible is a hard read), them.