Since the rebellion in Eden God’s purpose has been to produce a seed. Because of his faith Abraham was chosen as the one through whom the seed would eventually come. Abraham’s grandson, Jacob, whose name God changed to Israel, had twelve sons that produced the twelve tribes of Israel. For that reason in later centuries God referred to the nation as “Jacob” and more commonly “Israel.”
Eventually, Judah produced the Christ and after that others were anointed to become part of the seed along with Jesus. Because they are to be the actual seed of blessing God promised would come through Abraham, the Christian seed is the real Israel of God. Paul explained these things in his letter to the Galatians.
At any rate, the Christian Israel of God became corrupt too, just like Israel had before it – even as the founding apostles foretold would occur. But before the conclusion of the system a new generation of anointed persons would appear in the world, thus constituting the Israel of God in modern times. Since its inception the Watchtower Society has been the seedbed for anointed Christians (and consequently the weed patch as well) first called the International Bible Students and since 1931, Jehovah's Witnesses; making Bethel a sort of capital city for the spiritual nation that has formed.