But to open that can of worms is to introduce the idea that every text can be subject to such manipulation and so every one of those passages by ancient authors they cite must be buttressed against it . . . To introduce doubt to a world of black and white fundamentalism is what they are very keen to avoid.
Very true. Haven't thought about that when I was writing my post. If they wanted to write more extensively on Josephus and Tacitus, they would have to explain how Josephus' second reference to Jesus is a later interpolation, even though its core is original according to the majority of scholars. Unless, of course, they were to claim that the whole passage comes from Josephus directly, which would be entirely absurd and likely foolish. Still, if they wrote that Josephus' second reference had been tampered with, you are right that in essence they would be acknowledging that every historical source and text is subject to manipulation.
To those followers of the Governing Body, it seems that Paul wrote all of the letters in the New Testament, and there is no further discussion with them. To them, it seems that Matthew, Mark, and Luke were written by actual Matthew, Mark, and Luke, and that those gospels were completed before the Jewish revolt in 66–70 CE. Oh, and how fiercely will they defend their notion that Jesus actually prophesied that the Temple would fall . . . because the gospels say it, so they must have been written before the revolt. They don't acknowledge any suggestion that it may not be as clear as the Governing Body tells them it is.
But if they did acknowledge that, they would be in essence admitting that the the authorship of the Bible is not so clear. Don't even get them started on how the gospel writers actually knew all those details about Jesus, such as what time it was when this and that happened, how Jesus sat down when he sat down, how Jesus said the words he said, and what exactly he said . . . Although I do wonder what they would say to that. Have you ever asked them about it?
P.S. I'm not sure where my head was when I was writing my first post in this thread. Grant was also a historian...