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That's the example I was talking about. The entire "Lord's Prayer" doesn't even appear anywhere in the Gospel of John. In fact, John tells a very different account of Jesus' ministry that differs substantially from the other three Gospel accounts. John doesn't describe the temptation of Christ, Jesus' transfiguration, the last supper, the sermon on the mount, or Jesus casting out demons. John also describes several occasions in which Jesus visited Jerusalem prior to the passion week, which are not mentioned in the synoptic Gospels.
So for some experts, it is arguable the Book of John was not written contemporaneously with the rest of the Gospel, or at the very least it represents a considerably different view of the story of Christ. Since it deals with Jesus' early Galilean ministry, which is not found in the Synoptic Gospels, (Matthew, Mark and Luke), it could be a "prequel" style account of Jesus' ministry that wasn't actually written until sometime after the Synoptic Gospels were written. Nobody really knows for sure.
Then we have the "Apocrypha", the books of "Esdras, The Wisdom of Solomon, Bel and the Dragon, Tobit, Judith, Baruch and Ecclesiasticus" (along with seven other booklets), which were published in the original King James Bible in 1611 and were believed then to be part of the Old Testament, which were later separated from the Old Testament by Martin Luther and given their own place between the Old and New Testament, but which have always appeared in the Old Testament of the Catholic Bible , and are later completely omitted from later versions of Bibles as being non-canonical, or "Apocrypha".
Of course, lets not forget to mention the "other" testimony of Jesus Christ represented by the Book of Mormons. Ever read that one ? It's a pretty unconventional read.
So the question is, to which of the many edited, appended and transliterated versions from the original Hebrew and Greek text do you refer to when you claim a "complete and correct" understanding of what is written in the Bible is so essential to our salvation ???
I'm just curious, because it appears to me no one will know what is "complete, or correct" until the Second Coming of Christ occurs.