Mormon’s present “The Book of Mormon” as holy scripture.
Jehovah’s present “The Watchtower” as holy scripture.
Both groups push false prophets (Joseph Smith and Charles Russell) that are outside the realm of Christendom.
But doesn't the Bible say that "WHOSOEVER believeth in Him shall not perish, but have everlasting life"? I don't see any codicil like "unless he believes in false prophets" there.
I've also heard of some fundamentalist Christian sects who consider Catholics non-Christian because of prayer to saints and following a pope. Don't their beliefs in Christ as Savior count? Again, I don't see "unless they only pray to Me directly and don't ask a Saint to do so on their behalf".
You and I know that Saints are dead people who will be raised up with all the rest on the last day. But a believer in Christ who "knows" that they are in Heaven interceding with God on his behalf still "believeth in Him".