Renoard, the point is that Kaz said he disagreed with me, but I didn't really say anything in my post for him to disagree with. I didn't even say the Book of Mormon was scripture. (Though that is what I believe.)
All I was talking about was the lost 116 pages of manuscript and how they related to the rest of the book. But I'm not even sure Kaz knows the story about the lost 116 pages of manuscript. (Which is, in short, when Joseph Smith started translating the book, Martin Harris worked as his scribe, and Martin's wife wanted to see the pages, so Joseph gave them to Martin and they got lost. That part of the story in the Book of Mormon, the beginning of the book, had to be covered again when Joseph got to the end of the book, and the claim in the Book of Mormon is that this section of the history was presented in two different books within the Golden Plates, so Joseph used the other section instead of retranslating the part that went into the 116 pages that were lost.)
LDS believe that the gospel we preach is the gospel Christ preached and the Book of Mormon is another testament of Christ. And that God himself, and his prophets, never said there would be no more scripture or revelation from heaven, and that what constitutes scripture is not something that should be decided by committee. But anyway the belief in extracanonical scripture is not the most commonly cited reason other Christians claim Mormons aren't Christian. The most common reason I've heard is that Mormons aren't Christian because we don't believe in the classical Trinity, that Jesus is his own father. And LDS counter that by saying that idea isn't in the Bible anyway.
But this has been done to death in other threads.
And Jade said right in the second post, "many people here would say yes, many would say no."