This has VERY much to do with physical descent, since the “Khazar theory” is used as a club against the Jewish people in the land of ISRAEL.
It’s NOT a NT theology issue.
And if ye be Christ’s, then are ye Abraham’s seed, and heirs according to the promise.
And yet some people still worry about ancestry according to the flesh.
How do Jews of whatever sort deal with that khazar theory?
video answered me.