How do we become children of Abraham if not through physical descent?
A person becomes a child of Abraham spiritually, not by physical lineage, but by believing the Gospel and being placed in Christ and His Body. Abraham himself was saved by faith plus nothing, so all who believe are tied to him as heirs of the promises made to Abraham.
Les explains that the connection to Abraham is not through earthly progeny; it is only in the spiritual realm that believers become the children of Abraham. As soon as a person becomes a believer of the Gospel, that person is one in Christ, in the Body, and then becomes an heir of the promises made to Abraham. Abraham’s promises went beyond the Nation of Israel, and Abraham was saved by faith plus nothing—not by sacrifices, circumcision, or Law—because he believed God. That is what ties believers to Abraham.