Subject to site rules, name an opinion you have about a particular subject that many people would disagree with.
OK here is a good one, pertinent to your background as a Messianic Jew. I have often argued against the general depiction of Christian history typically to many Messianic websites etc. Many of them blame anti-Semitism as a kind of grand unifying theory for Church history.
I acknowledge antisemiticism as an ingredient but I believe their is a lot more going on than just that.
Here is my list of topics besides that....
1) Antigentile attitudes in Judaism (the Talmud gives the best examples)
2) the role of heretical groups like the Ebionites
3) The change of the synagogue prayers against the minim
4) The change in ethic demographics in the Church over time coupled with
5) The "One Body" theology of the Early Church
6) The established realization that you cannot earn your salvation by your works. As the numbers of Jewish believers diminish it becomes easier an easier to "go native". Besides that it is also easier so more incentive if being Jewish is not central to your identity.
7) The Existence of Semitic Christian bodies. Even some of the anti-semetic things claimed against Constantine etc. I believe are often not as malicious as people claim. I'm rusty on the details of Constantine etc., but would point out Their are a number of Christian Churches that descend from Jewish believers in Africa and the Middle East. They often had Jewish customs, and some of them had Aramaic / Syriac as their Holy Language. Anyway much of the stuff claimed against Constantine was simply Constantine trying to get the early Syriac Christians, Ethiopians etc. to be worshipping at the same time, in the same way with the rest of Christianity because at the time being "One Body" was what people were trying to do.
8) I also believe the rabbinic system was a factor etc. I have a Messianic rabbi friend who I talk about this stuff to once in a while. Most people see the school as Shammai as a bit of a problem in Judaism. It wasn't totally wrong, but most of the problems we see in the NT with the Pharisees and "Judaizers" in the epistles/Acts comes from it. My friend sees it totally differently. (He believes the school of Hillel sand bagged Shammai as far as how history is written).
Anyway my friend has a Messianic Karaite ideal, he notes that Karaites had and have their synagogues too. The problem I see with this is the history behind that movement. Rabbinic Judaism is well documented. The first synagogues we see in the Babylonian Diaspora, and you see Rabbinic Judaism following close behind that. The earliest examples of Karaite Judaism comes from post Islamic Iraq somewhere in the middle of the 600s AD.....
(I believe that movement was a Reformation movement and not something that existed during the time of the New Testament onward).