The Israel Of God.
The phrase 'the Israel of God' is often used by some to connote the sum total of believers, Jew and Gentile that are "spiritual Israel". The Bible never uses the phrase spiritual Israel at all, while it says that all saved of the Jews and the Gentiles are spiritual children of Abraham. When God made the Abraham Covenant of Promise with this Patriarch, in the Genesis 12:1-3 and 17:1-8, there was no division of the people of the world yet as to Jew and to Gentile, for that would not come to be till the birth of Isaac through which the line of Israel. And this spiritual covenant with Abraham was to be through Abraham's SEED, the Lord Jesus Christ, not as to seeds indicating many physical descendants. The blessings of the nations at a time when there was no distinction of types of peoples was not promised therefore through the physical nation Israel, nor be of the remnant as in many, but be of Christ alone and at that in the New Testament Covenant. Today Jew and Gentile are in the body of Christ, the Church, together, but Gentiles do not come into this blessing by any covenantal clauses made via Israel but via the Messiah of the world. Certain verses are used out of their contexts and diverse parts of these verses are quoted that are not applicable. Let us look at some.
In John 15:1-14 we read the passage of the vine and the branches an v.1-2, says, "I AM the true vine, and my Father is the husbandman. Every branch in me that beareth not fruit he taketh away...". And in v.4,5 it is written "Abide in me and I in you. As the branch can not bear fruit of itself, except it abide in the vine; no more can ye, except ye abide in me. I am the vine, ye are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit......" When one considers these words and the entire context of the passage, one comes to understand that the Lord is speaking of staying in him, for he is God and the source of all needed to make us fruitful. It is not referring anywhere to the nation of Israel.
Another verse used is that referencing the grafting of the wild olive branches unto the root of the olive tree in Romans 11. Let us set up the message, "God has not cast away his people (Jeremiah 31:7) that he foreknew.... even so then at this present time also there is a remnant according to the election of grace..." (Rom 11:2,5). Now for the second part of the chapter, on the warning to the Gentiles not to boast as to having been grafted in the root of the olive tree, as the natural olive branches have been cut out (13-25) and let us begin at verse 16, "For if the firstfruit be holy, (apostles/disciples) the lump is also holy: and if the root be holy (which is Jesus Christ) so are the branches. Gentiles as branches from a wild olive tree are grafted against nature (the grafting goes of good branches into the wild olive tree nor of wild branches unto a normal olive tree) but in Christ can produce good fruit. In the entire passage it becomes clear that the root is the Lord Jesus Christ and it is not the nation of Israel. Of Israel it is said, "For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own own conceits; that blindness in part is happened to Israel, until the fullness of the Gentiles be come in". While the nation of Israel presently is in blindness, one day it will be able to see after that the fullness of the Gentiles be come in. Israel is the olive tree in the passage but what it is made clear that it is He, the root, Jesus Christ, that is the power to produce fruit. These verses therefore cannot be exegetically used to mean that Gentiles must enter into Israel so that they can be blessed and be fruitful, for at present Israel herself is not even rooted in Him. Gentiles are fruitful in Jesus Christ and are blessed under the New Covenant of promise, the continuation and culmination of the equally unconditional covenant of promise made with Abraham. And this being the book of Romans, this blessing on the Gentiles comes in the Church, the body of Christ, a people God took out for his name (Acts 15:14).
Finally in Galatians 6 the HS via the apostle Paul writes to this Gentile church saying that as he, they are to glory in the cross of the Lord Jesus Christ, for in him they are new creatures and pronounces a blessing of peace and mercy on them and upon the Israel of God (6:14-16), two separate entities. What Paul is not saying that all believers are the Israel of God nor should this phrase be used to intern all Gentiles into Israel somehow and then call it "spiritual Israel".