Israel National served three purposes, which all three have been fulfilled since the Death of Christ,
First, they were chosen to bring forth the Messiah; secondly, they were a figure or a type of the worldwide church which was to come; and thirdly, their obedience and disobedience was to serve as an example to the church today.
Now when we switch to the New Testament, we plainly see that God no longer dwells upon the subject of the physical seed but upon the spiritual seed. The physical seed was important up to the point of the cross. Since Christ died, the physical seed was no longer needed as a type owing to the fact the church would soon be born on a universal scale.https://www.scionofzion.com/israelofgod.htm