Because people here put everything into question. Even the very existence of Jesus.
But anyhow, Bluescat, the original post wanted to disprove the bible by assuming it is true, nd then showing that it is inconsistent with itself. It is therefore completely adequate that calypsis shows that it is using oher parts of the bible as reference.
Wanting to descredit the Bible by taking Matheu 16:27-28 as the true words of Jesus, only to go around and doubt the biblical answer as genuine won't convince anyone about it but your own self.
It would be like saying: ''The bible says that John the Baptist would open the way to the messiah, but in fact he never did''. And when someone replied ''Well in christianity, Jesus is the messiah and so he did in fact open the way for him'' only for you to reply ''Oh, but I don't think Jesus is the messiah''. The conversation could even go on and yo ube asked ''why don't you believe that jesus is the messiah'' and you would answer ''Because the bible is inconsistent, as with my earlier example of John The Baptist''
The reality is, as to show a book is inconsistent, you have to assume all of it is true and show how it is, not take away the parts that would be the answers to the dilemnas.
It is the simplest and easiest thing to do to reveal inconsistencies in a book where you take away parts ... Hell, you can probably do it with every single book on earth.