I am going to attempt to briefly cover what the Bible teaches about exclusivity. Most believe the bible to be a very inclusive or universal book. In order to keep this brief I am going to only use four verses. I may add more later, but it could get out of hand if I keep adding. I like to keep articles short and let you do some of the study for yourself.
Acts 17:26 "And hath made of one blood all nations of men for to dwell on all the face of the earth, and hath determined the times before appointed, and the bounds of their habitation."
1 Timothy 2:4 "Who will have all men to be saved, and to come unto the knowledge of the truth."
Revelation 5:9 "And they sung a new song, saying, Thou art worthy to take the book, and to open the seals thereof: for thou wast slain, and hast redeemed us to God by thy blood out of every kindred, and tongue, and people, and nation".
Revelation 7:9 "After this I beheld, and, lo, a great multitude, which no man could number, of all nations, and kindreds, and people, and tongues, stood before the throne, and before the Lamb, clothed with white robes, and palms in their hands".
On the surface, the English translation of these verses makes them look very inclusive. We will examine the context and the Greek as needed. God promised Abraham Jacob and Ephraim that their physical children would become many nations, a company of nations and a multitude of nations. During the time of King David, Nathan the prophet told David that Israel would eventually be given new land. This would be required for the promises of plural nations to be accomplished. So, consider that when you see the word Nations or Gentiles that the context may be the Nations of Israel. Let's take a look.
We will start with Acts 17:26. It is very popular today to say that all men have the same blood. However much biological research shows that the blood of the men of each race is as different as the external appearance of the men of each race. The word blood in the Greek includes the blood of animals. We do not share a common ancestry with bulls and goats. The "all" in the phrase "all nations" comes from the Greek word pas.
The Greek word pas (G3956) when applied to a group means "all of that part", or "every one of that part", or "whosoever of that part". A lot of the verses that people use to teach a very inclusive gospel actually teach an exclusive Gospel.
So the phrase "all nations" in Acts 17:26 should be understood as "all of that part of nations". It is not inclusive in its meaning. We know that many living in Greece at the time of Paul were of the dispersion of the Northern Ten Tribes.
1 Timothy 2:6 "Who gave himself a ransom for all, to be testified in due time."
In looking at the context of 1 Timothy 2:6 it should be noted that in discussing those same men the text says that Christ gave Himself as "a ransom for all". We are dealing with the exclusive Law of the Kinsman Redeemer. Those men then had to be kin of the one doing the ransoming or redeeming. The act of redemption is exclusive to true Israel.
1 Timothy 2:7 "Whereunto I am ordained a preacher, and an apostle, (I speak the truth in Christ, and lie not;) a teacher of the Gentiles in faith and verity."
The Latin word Gentiles was inserted into the text in verse 7 by the translators protecting church doctrine of their day. Paul actually used the word Nations. He did this instead of using the word Israel letting us know that he was specifically talking about the Ten Northern tribes. Hosea details the impending divorce of the Ten Northern Tribes by God. These tribes then lost the right to be called Israel and were renamed "not my people" in Hosea 1:9. These "not my people" are the subject of Romans 9:24-26.
Romans 9:24-26 "Even us, whom he hath called, not of the Judeans only, but also of the Nations (Gentiles)? As he saith also in Hosea, I will call them my people, which were not my people; and her beloved, which was not beloved. And it shall come to pass, that in the place where it was said unto them, Ye are not my people; there shall they be called the children of the living God."
Paul tells us that the "not my people" are the Nations of the Ten Tribes of Israel or in some bibles Gentiles. Hosea also tells these people that they would one day be "sons of the living God" or Christians as has in fact happened.
Hosea 2:23 "And I will sow her unto me in the earth; and I will have mercy upon her that had not obtained mercy; and I will say to them which were not my people, Thou art my people; and they shall say, Thou art my God."
The word sow is key and is explained further in the parables of Matthew 13 and is connected to Amos 9:9. One should include Romans 9:23 if researching. Now let us take a look at a Greek word in verse 4 that is translated all.
1 Timothy 2:4 says "all men". The word "all" is from the Greek word pas. Therefore the phrase "all men" should be understood as "all of that part of men". It is not "all men everywhere". In this case it is the part of men who, as verse six says, were ransomed or redeemed. Only Israel can be ransomed or redeemed according to the Law of the Kinsman Redeemer.
For Revelation 5:9 and 7:9 part of the answer is in the Greek preposition "ek" meaning out of. It turns out that both verses answer the prophecy of God in Amos 9:9 to sift the children of Israel "among" all nations.
Amos 9:9 "For, lo, I will command, and I will sift the house of Israel among all nations, like as corn is sifted in a sieve, yet shall not the least grain fall upon the earth."
God spread the children of Israel through deportations among the nations and then brought them "out of" all nations to the new promised lands, 2 Samuel 7:10.
The word plainly says "out of" in Revelation 5:9 along with the use of the word redeemed. Remember redemption is based on the exclusive Law of the Kinsman Redeemer. Redemption is exclusive to true Israel. One must be kin to act as the Kinsman Redeemer. This is why Christ’s lineage is listed in Matthew 1 and Luke 3. The word translated "every" in the phrase "every kindred" is also from the Greek word pas. The meaning therefore is "every one of that part of kindred, and tongue, and people, and nation". The part is of course those redeemed. In the next verse "kings and priests" is a promise to Israel.
In Revelation 7:9 the translators used "of" in the KJV when it should read "out of" all nations. The word translated "all" in the phrase "all nations" is also from the Greek word pas. The meaning therefore is "all of that part of all nations, and kindreds, and people, and tongues". The verse also starts with "After this", but the Greek meaning is "Amid or Among this". Among this is included a listing of the twelve tribes or nations of Israel who were sealed.
Scripture word meanings are extremely important. Scripture defines its own terms. In that regard even the word World found in John 3:16 does not mean the entire world. It is a society, the orderly arrangement, a part of the whole world. It is important to remember that the people of Israel now make up many nations, a multitude of nations and a company of nations as promised to Abraham, Jacob and Ephraim.
Jeremian 3:14 "Turn, O backsliding children, saith Yahweh; for I am married unto you: and I will take you one of a city, and two of a family, and I will bring you to Zion"
Amos 3:2 "You only have I known of all the families of the earth: therefore I will punish you for all your iniquities."
Besides the fact that Replacement Theology, the bringing in of a new people that God never knew, has God abandoning the people who had been His wife and was promised to remarry, they have God breaking promises and prophecy all through the scripture.
Scripture promises that the true physical Israelites would take the light of the Gospel to the world as they formed many nations. The modern day Jews are not Israelites.