As a former teacher, you might appreciate how many red check marks I made as I graded your composition. I certainly appreciate the work teachers accomplish involved with correcting 30 or more essays at a time! It's taking me all afternoon with just one.
Researching Harnack, it quickly became apparent that his Hellenistic Theory was wrong from the get go, and as a basis for your work in this article, it was therefore creating a slippery slope, creating a false dilemma from hasty generalizations, because the authority of Harnock is feeble at best - lots of words, but his intellectual prowess does not cover up his ignorance about God, Jesus, and the Bible.
Now, I don't know if going paragraph by paragraph would be welcome or have any positive effect on discussing the topic. There were only two or three paragraphs that escaped my little red pencil. However, I feel that I must say something, and I'll try to be brief.
"Where is the wise man? Where is the scribe? Where is the philosopher of this age? Has not God made foolish the wisdom of the world? For since in the wisdom of God the world through its wisdom did not know Him, God was pleased through the foolishness of what was preached to save those who believe.
Jews demand signs and Greeks search for wisdom, but we preach Christ crucified, a stumbling block to Jews and foolishness to Gentiles, but to those who are called, both Jews and Greeks, Christ the power of God and the wisdom of God.
For the foolishness of God is wiser than man’s wisdom, and the weakness of God is stronger than man’s strength."
I challenge many of your facts, not only because they are, on their face, errant, but you forgot numerous times to mention the sources of your information. One example is your statistical claim of a "small group," that only remained relatively small until the Day Of Pentecost. Repentance and forgiveness of sins is a foundational building block of earliest Christianity and not something conjured up hundreds of years later, but it was contained in the Promise to Eve from the very start. Also, from Jesus' baptism by John, "Jesus began to preach, 'Repent, for the kingdom of heaven is near.'"
There was no abandonment of the ministry to the Jewish communities no more than there was to the Gentile nations:
"...they saw that I had been entrusted to preach the gospel to the uncircumcised, just as Peter had been to the circumcised. For the One who was at work in Peter’s apostleship to the circumcised was also at work in my apostleship to the Gentiles. And recognizing the grace that I had been given, James, Cephas, and John—those reputed to be pillars—gave me and Barnabas the right hand of fellowship, so that we should go to the Gentiles, and they to the circumcised.…"
As for your imaginary census count and news reports of the unimpressed Greeks there is this one of several accounts:
"The priest of Zeus, whose temple was just outside the city, brought bulls and wreaths to the city gates, hoping to offer a sacrifice along with the crowds... ...Even with these words, Paul and Barnabas could hardly stop the crowds from sacrificing to them."
As for your ability to read the minds of people living in generations past and your ability to psychoanalyze them with such accuracy is amazing! The Apostles' failure to warn their congregants about false teachings, doctrines, and alternate "gospels" truly amazes me... I must have been reading the Bible wrong... or maybe it's you...
It is pointless to continue without some response from you. However, you really should read the book of Acts, John's Gospel and his letters first. I think maybe you've loaded the cart before buying the horse to pull it along.