We Gentiles, in time past of Matthew, Mark, Luke and John even all the way to Acts 19 can be shown as Gentiles "at that time" being "without Christ, being aliens from the commonwealth of Israel, and strangers from the covenants of promise, having no hope, and without God in the world" according to Ephesians 2:11-12 KJV so please refrain from using the mystery of the gospel (Ephesians 3:6 KJV) as proof text of John when Ephesians 3 is a late mystery revealed to and through Paul (who was exclusively given the dispensation of the grace of God to us) which was before not made known to the sons of God, unsearchable and hid in God before Paul. Thank you.
Ephesians 3:1 For this cause I Paul, the prisoner of Jesus Christ for you Gentiles,
Ephesians 3:2 If ye have heard of the dispensation of the grace of God which is given me to you-ward:
Ephesians 3:3 How that by revelation he made known unto me the mystery; (as I wrote afore in few words,
Ephesians 3:4 Whereby, when ye read, ye may understand my knowledge in the mystery of Christ)
Ephesians 3:5 Which in other ages was not made known unto the sons of men, as it is now revealed unto his holy apostles and prophets by the Spirit;
Ephesians 3:6 That the Gentiles should be fellowheirs, and of the same body, and partakers of his promise in Christ by the gospel:
Ephesians 3:7 Whereof I was made a minister, according to the gift of the grace of God given unto me by the effectual working of his power.
Ephesians 3:8 Unto me, who am less than the least of all saints, is this grace given, that I should preach among the Gentiles the unsearchable riches of Christ;
Ephesians 3:9 And to make all men see what is the fellowship of the mystery, which from the beginning of the world hath been hid in God, who created all things by Jesus Christ:
In your quest to put yourself back there in John, you are failing to rightly divbide the word of truth (2 Timothy 2:15 KJV). Come on, BR.
From Gotquestions.org
To understand who the “other sheep” from John 10:16 are, we must begin with the context of the verse and examine the whole passage. We know from many Bible passages that sheep are a symbol of true believers who follow Christ, their true Shepherd. His sheep hear His voice and follow Him. If He says that there are “other” sheep, then we must identify the original sheep that the “others” are different from.
Beginning in chapter 9 of John, we find Jesus discoursing at great length with the Pharisees after He healed a man who was born blind. He compares the man’s simple faith with the unbelief of the Pharisees and condemns them for their willful spiritual blindness. He begins by denouncing the false shepherds of Israel—the blind, self-appointed leaders who drew the people away from the true knowledge and kingdom of their Messiah (John 9:39-41). Then in chapter 10, He explains at great length the nature of true sheep, those who follow the Good Shepherd, sent and appointed by God. True sheep are those who listen to the voice of the Shepherd (v. 3) and follow Him (v. 4) and know Him (v. 14). He can only be speaking here of the true sheep of Israel because, up to that point, His ministry was confined to the sheep of Israel.
In verse 16, Jesus refers to the “other sheep,” and those can only be sheep that are outside of Israel, in other words, Gentiles. But the Gentiles who would follow Him are no less sheep than the true sheep of Israel. In fact, Jesus makes it clear that the Gentile sheep would also hear His voice and follow Him, and, eventually, there would be only one flock and one Shepherd. This is the mystery of the universal body of Christ, the church, which Paul refers to in Ephesians 3:6, “This mystery is that through the gospel the Gentiles are heirs together with Israel, members together of one body, and sharers together in the promise in Christ Jesus.” A mystery in Scripture is usually something not revealed previously, and this mystery—one universal church with both Jews and Gentiles brought together in one body in the Messiah—was so shocking to the Pharisees that they accused Jesus of being a demon-possessed lunatic (John 10:20-21).
Paul’s commission from Christ was to “preach to the Gentiles the unsearchable riches of Christ” (Ephesians 6:8) because the Gentiles, the “other sheep,” needed to be brought into the fold of the true Shepherd. Paul explains in Romans 11:16-36 the mystery of the church by using the imagery of a branch (the Gentiles) being grafted into the tree (Israel). Israel has been temporarily set aside until the “full number of the Gentiles has come in” (Romans 11:25). This is occurring now in the Church Age, but eventually both Jews and Gentiles will live in glorious harmony in the Millennial Kingdom and then in eternity when all true sheep will follow their Shepherd forever as one body.