Bernard Muller wrote: Why not Diaspora Jews also (as likely for gMatthew)?
Cordially, Bernard
While here were Jews in the Diaspora. These were not oppressed Israelite Jews.
The authors of Matthew were Proselytes and gentiles who were definitely divorcing cultural Judaism copying the text written for Romans "Mark"
You need to remember there is a reason why this whole movement did not originate from Israel. It originated in the Diaspora with no one center of origin.
Had this been a sect of Israelite Jews that slowly evolved into Diaspora Hellenistic Judaism, by the text alone we should see a center in Israel and at least writing from Israel itself by people who actually found the founding fathers valuable and or important.
What we see is Israelite Jews refusing all of the Jesus theology WHOLE. And Hellenistic Proselyte Judaism and Gentiles who found value in the new theology expanding it.
LAST when we get down to fist century Judaism most people forget the impact the temple had on Diaspora Hellenistic Proselyte Judaism which was massive. And we also see gentiles being called Jews in Hellenistic circles simply for swearing off other deities [proselytes jewish encyclopedia] without all the cultural trappings like circumcision which is another reason why Proselyte numbers increased.
Jewish monotheism was evolving into the roman culture full speed ahead. With all the political turmoil these people did not want to be identified as a Jew.