During Old Testament times, before this present “dispensation of the grace of God” began, Gentiles were only blessed through the exaltation of Israel, as God’s chosen people through whom He would bless the world.
As you would see, Old Testament passages such as Gen.26:4; Gen.28:14; Is.2:1-4; Is.27:13; Micah 4:1-3; Zech.8:20-23; Zech.14:16; etc., made it clear that Gentiles would never be able to approach God without first blessing the nation of Israel.
But such is not the case today, though, because the Apostle Paul states that Gentiles are now saved through the fall of Israel, rather than through her exaltation, in Rom. 11:11-13:
11: I say then, Have they stumbled that they should fall? God forbid: but rather through their fall salvation is come unto the Gentiles, for to provoke them to jealousy.
12: Now if the fall of them be the riches of the world, and the diminishing of them the riches of the Gentiles; how much more their fulness?
13: For I [Paul] speak to you Gentiles, inasmuch as I am the apostle of the Gentiles, I magnify [honor] mine office:
The context of the above excerpt from Romans 11 is established in verse 7, where Paul states that "...Israel hath not obtained that which he seeketh for; but the election [only] hath obtained it, and the rest were blinded". So, when Paul states just four verses later that through "their fall" salvation is come unto the Gentiles, he is obviously referring to the "fall" of Israel.
As a result, the gospel by which Gentiles are saved today is no longer dependent upon blessing Israel. Rather, our salvation is based upon the fact that "Christ died for our sins", as Paul writes in 1 Cor. 15:1-4:
1: Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand;
2: By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.
3: For I delivered unto you first of all that which I also received [cf. Gal. 1:12), how that Christ died for our sins according to the scriptures;
4: And that he was buried, and that he rose again the third day according to the scriptures:
- Not once does the Old Testament scriptures ever foresee that Uncircumcised Gentiles would someday be saved through Israel's fall.
- Nor did the Old Testament prophesy that Christ would die for the sins of Uncircumcised Gentiles, as Paul explains in the above passage.
One may search the scriptures from Genesis through the book of John, and never find any mention of these doctrines, because they are identified with the "mystery" that was revealed to Paul alone… for this age’s Gentile dispensation of the grace of God.
Salvation today is totally apart for Israel, her circumcision, her water baptism rite, or any of the Mosaic Law program.