Pericles,
You seem to imply that people LIVING TODAY have used the Bible to prove their ancestry from Jacob's Israel.
Historical or anthropological records as maintained by human beings
are exceedingly insufficient and grossly incapable of proving lineage and
identifying those who are descendants from the tribesmen of Jesus Christ
of Nazareth.
Let me show you how Israelites are PROPERLY and accurately identified
please read--
Luke 1:11 And there appeared unto him an angel of the Lord standing on the right side of the altar of incense.
12 And when Zacharias saw him, he was troubled, and fear fell upon him.
13 But the angel said unto him, Fear not, Zacharias: for thy prayer is heard; and thy wife Elisabeth shall bear thee a son, and thou shalt call his name John.
No so called historical or anthropological records were needed to identify Zacharias as an Israelite.
Please read this very , very carefully and answer with appropriate depth.