Just by simply looking at the arguments already posted, the book of Barnabus contradicts the message of the gospel.
This is my conclusion:
That books are likely to be added to the bible.
Maybe the scribe took it upon himself to add that story that is inconsistent with the gospels. Is that available with Vaticanus? I would say not.
Paul. You said you use Papyrus. Why would you use Papyrus? Have you studied them mate. See, I have no problem if you just said that you study the codexes. But seriously, Papyrus? The oldest papyrus found is p52. You should take a look at it.
Also you were talking about Vaticanus and Sinaiticus. Do you know that there are over 3000 variations between those two?
Now you quoted that Barnabus maybe a forgery. Then how about the letter of Clement?
You said you use Alexandrinus. Have you seen it. I mean at least a digital copy? It has so many books never found in any of the modern bibles. Do you believe in them? If you dont believe in them why the double standards?
Nevertheless my point is Paul, I just wish that you look at evidence rather than quoting books for the sake of argument.
I think when you said the book of Barnabus that goes against the other books of the bible you were referring to the Gospel of Barnabus. Thats a dubious book, mostly regarded as a forgery. Codex Sinaiticus has the epistle of Barnabus. A completely different text. Now without knowing this you were quick to negate the book by giving an excuse, forgery. Honestly, I am taken extremely by surprise.
Peace.