Born again believer
I think that a sign of that someone is a born again believer in the lord Jesus Christ is that they believe that the entire bible is true.
Every word of God is pure: he is a shield unto them that put their trust in him.
Not just a part of the bible is true but rather Genesis to Revelation. And that they dont add extra biblical books to the scripture like the Apocrypha or the gospel of Mary or the gospel of Thomas etc.
Its also a sign of that someone is born again that they have understood the bible version issue. That is that they notice that there is a special anointing of the holy ghost in the king james bible and or the other inspired bibles.
Though for example if someone speaks only Swedish and don't have access to the Karl12 bible, how are they going to get in contact with the inspired bibles. But they can still be born again of course. We are eternally saved by God and not by a book.