1st Timonthy 1: 3 As I urged you when I was going to Macedonia, remain at Ephesus that you may charge certain persons not to teach any different doctrine, 4 nor to occupy themselves with myths and endless genealogies which promote speculations rather than the divine training that is in faith; 5 whereas the aim of our charge is love that issues from a pure heart and a good conscience and sincere faith. 6 Certain persons by swerving from these have wandered away into vain discussion, 7 desiring to be teachers of the law, without understanding either what they are saying or the things about which they make assertions.
And following in Romans 9;6b For not all who are descended from Israel belong to Israel
Further in the letter:
9:30 What shall we say, then? That Gentiles who did not pursue righteousness have attained it, that is, righteousness through faith; 31 but that Israel who pursued the righteousness which is based on law did not succeed in fulfilling that law
Pursue the law, and die within it...for:
Romans 3:20 20 Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law is the knowledge of sin.
Spiritual Israel is NOT justified in the flesh.
Further on Spiritual Israel:Romans 3:29
Is he the God of the Jews only? is he not also of the Gentiles? Yes, of the Gentiles also
And again: Romans 4:1 What shall we say then that Abraham our father, as pertaining to the flesh, hath found?...
Another:
Romans 4:17 17 (As it is written, I have made thee a father of many nations,
and ANOTHER:
Nah...I'm going to give up. If you haven't read the book of Romans...then you just don't understand. If you HAVE read the book of Romans, then you have no discernment.
The lost tribes stuff is something that is kinda 'neat' to think, but has no basis in salvation. I would rather be a SAVED GENTILE, than a 'lost tribe'