I think some have missed the point. When we put on Christ we become heir to the promises of Abraham given to the Jews.

Gal 3:29 And if ye be Christ's, then are ye Abraham's seed, and heirs according to the promise.

We become Abrahams seed. Could it be that those who are Abrahams seed and accept Jesus Christ are part of the lost tribes of Israel?

Rom 2:29 But he is a Jew, which is one inwardly; and circumcision is that of the heart, in the spirit, and not in the letter; whose praise is not of men, but of God.

Bro. Danny