As to ethnic Israel, is God finished with them? Did he change His immutable (unchangeable) mind in regard to all the promises to the OT Abraham, Jacob, Isaac, and David? I think not; rather I would argue your Replacement Theology is a construct.
I think God's promises to Abraham, Issac, Jacob and David as being father (s) of many nations is indeed fulfilled because through Christ the Gentiles (ie many nations) were grafted into the people God first chose to reveal Himself through have become one as the body of Christ in The Church.
I know you do; that is known as Replacement Theology. Grafted INTO, yes, but no does that not imply the "original vine is still alive".
