1robin
Christian/Baptist
That is just a theory and there is so much unique to the other Gospels that they probably all started with earlier texts and oral traditions and added what was unique to their audience and intent.I guess I'm just confused as to what you mean by "accurate." What could they compare the Bible to in order to judge it's accuracy? Mark was a guide for the rest of the Gospels, as it was written first, so comparing gospel to gospel seems like a worthless endeavor.
This is a very complicated issue but I am going to make it as simplistic as I can. There are a few things necessary to have almost certainty as to what the original texts said if you do not have them.
1. Early copies. The bible has more and earlier copies than any other work in ancient history of any kind.
2. Prolific copying. The bible has probably been copied more than any other work in history.
3. Independent textual traditions. IOW no one group maintained a preferred reading.
4. Non controlled copying. If you have an Uthman come along like Islam did and select the texts he liked and burn the rest you cannot know what the original said. The bible was not controlled, text copying exploded all over the place and no one entity controlled the transmission.
5. A bonus is to have early texts disappear only to be discovered hundreds of thousands of years later. Like the dead sea scrolls.
etc......
Even a few of those justifies confidence in a text but all of them plus others I was to lazy to list combine to give almost certainty as to the original.
Add in that 95% of the NT can be found external sources like the writing of the early church fathers alone, plus Paul's reliance on every earlier hymns and creedal statements, etc......