No, they may claim to believe in Jesus Christ, but in their mind you have to be a Mormon in order to go to heaven, plus they added a third testament to the Bible "The Book of Mormon", which is in direct violation of Revelation 22:18, "For I testify unto every man that heareth the words of the prophecy of this book. If any man shall add unto these things, God shall add unto him the direct plagues that are written in this book:" They have their reward coming to them, and it won't be pretty.
We, as Christians, believe that Jesus Christ is the only way to heaven and that without Him nobody gets to heaven. You don't have to be a member of any particular domination, just believe that Jesus Christ died on the cross for your sins and that He is risen from the dead.
My fundamentalist teachers tought me the same thing, but I thought the books of the Bible were written individually. Why would John refer to the entire Bible while he was writing Revelation? It specifically mentions prophecy, so couldn't that be referring to just Revelation in particular? Not trying to argue, just asking a question.
Shadow is right. 'Do not add to these things' appears to refer to the text of Revelation itself. The Bible, such as it is, did not even exist when it was written circa 100-120 A.D.