And I suppose you have the evidence to show that more Jews came to Christ than ever had existed to that point in time and that this still was only the minority or remnant that Isa 10:20-22 talks about. That is amazing.
Sure. Let's do the math.
Seventy souls went into Egypt with Joseph.
In 430 years, these seventy souls multiplied to about three million Hebrews who came out of Egypt.
The children of Israel were delivered by God around 1446 BC. This date is based on a literal interpretation of 1 Kings 6:1, which states that the Exodus occurred 480 years before the construction of Solomon's Temple. Solomon's Temple is traditionally dated to around 966 BC, which would place the Exodus around 1446 BC. For about 650 years the children of Israel continued to multiply (let's say one million more) until the captivity of the ten northern kingdom tribes by Assyria in 722 BC.
After several battles lasting about seven years the Babylonians conquered Assyria and took many, not all, of the remaining ten tribes back to Babylon. After several attempts by Babylon to conquer the two tribes of the southern kingdom of Judah (with Benjamin) they finally succeeded in 586 BC taking many, not all, Hebrews into captivity back to Babylon.
In 538 BC Cyrus allowed the Jews to return to their land in Palestine yet only a remnant returned thus fulfilling Isaiah's prophecy of chapter 10.
Let's say a remnant of four million is about 400,00 Jews who did return with about three million six hundred who opted to remain is conquered Assyrian land and Babylon land and places in-between. The Neo-Babylonians conquered a great territory.
Let's say that from the time Cyrus allowed the Ephraimites to return to Israel until Jesus' arrival one million Jews were born in 538 years. That would make approximately one million four hundred thousand Jews in Israel. To round it out let's say 20,000 to 30,000 Jews were either killed or escaped their Roman war and occupation. Now we have about one million three hundred and fifty thousand Jews lived in occupation throughout all Israel, Galilee, Samaria, and nearby lands.
It is commanded and mandated in the Law of Moses for all males to be present at Jerusalem for this one of three holy Feasts and out of three million six hundred Jews in Gentile lands that one million did come to Jerusalem from all over the Roman Empire and beyond for the Feast. This would make two million four hundred Jews in Jerusalem and nearby cities.
When the Feast of Harvest (Pentecost) "was fully come" the Holy Spirit made three thousand Olive tree Israel converted into spiritual Olive tree Israel in that one day. Maybe half were visiting Jews from Gentile lands. When the Feast was over these 1500 born-again Jews returned to their homes and synagogues in Gentiles lands taking with them an outline of Peter's sermon, the Holy Spirit experience, and testimony of Jesus as King of the Jews and Israel's Messiah back with them. That's 1500 newly minted evangelists who shared their experience on the road most travelled and when they got back to Rome, Ephesus, Corinth, Philippi, Thessalonica, Macedonia, Phrygia, etc., they shared Jesus in their places of residence. If the Holy Spirit was POURED OUT, then you're looking at a free flowing Holy Spirit come to do what He was sent to do and that is to apply the salvation bought by the Son upon elect, Covenant Israel and a conservative number daily that Jesus said "should be saved" can amount to thousands a day all across Israel and Gentile lands throughout the Roman Empire and beyond. Even if it's only one thousand new births a day in all the then-known world then that would be seven thousand a week, 28,00 a month, 336,000 a year and for four decades until the destruction of the Temple we're looking at about thirteen million four hundred thousand Jews birthed and baptized into the body of Christ in forty years since Pentecost.
Or we can say that out of four million Jews alive all over the places they were scattered and in Israel, that a "great company" (over half) came to understand Jesus as their Messiah and King and born-again through the next four decades.
Two million Jews were born-again out of four million alive throughout the Roman Empire and land beyond towards the Orient.
Jesus got busy.