But how does "create disciples of every nation" necessarily mean "circumcise the gentiles?" Or, more accurately, how does it necessarily mean "proselytize all gentiles into Judaism?"
The problem is that in order to learn what the discples actually did with that command (how did they understand it and what happened afterward?), you have to read Paul and Luke...who Netzarim discounts.
That makes it convenient for him to make up his own version of what it all means.
There is no contradiction for Jesus to say that He was "sent for the lost sheep of Israel" and then later to send His own disciples beyond that horizon. Jesus is the final payment of God's contractual obligations of the Mosaic Covenant (fulfillment of the Law), and the start of a new covenant.
This is the truth, and a good assessment.
Real Judaism, in Jesus' time and ours, has always rejected the notion that the Gentiles must be circumcised, and that the Gentiles must keep the Sabbath in the same manner as the Jews. etc. This is based not on pharisaic tradition, but on careful analysis of the Torah over millenia.
This is why Jews who become Christians don't seem to have the problem with Paul and Luke that Gentile Christians who become infatuated with Judaism do (not meaning mainstream, orthodox Messianics here, just the extreme position of some). Religion of the outward kind is a powerful temptress of the carnal man. When people reject their own culture, they invariably look for another to embrace. Netz is of the camp in theology that tries to make the followers of Jesus like Jews and in doing so wipe out Jewish identity for Jews.
Why is this offensive? Some of us gave up our reputation, our family life and so much more when we chose to pick up our Cross and follow. We want to keep our culture though. We never forced Judaism onto the Gentiles, as we were raised to respect that the
Torah gives
different commandments to different nations. Now, people want to strip our identity from us, the last thing we have left of our own, and assume it for themselves. The church used to force Jews to become Gentiles, now by blurring the distinction people in Netz's camp want to wipe out our cultural identity and our heritage and take it as theirs.
Ever heard of a self-hating Jew? How about a self-hating Gentile? Is that not also a possibility?
I believe that Christ has made one new man, but he has kept the distinction of the Jews for His future purposes.
Some Messianics wrote about this before.
Furthermore, without Paul, you have a very weak case for the resurrection. It is also held by some modern scholars that Paul's doctrine informs the later accounts of the Gospels.
Paul is not "Paul" to me, he is Rav Sha'ul ZT"L (zekher tzadik livrakha- may the memory of the righteous be a blessing)