The present-day form of Rabbinical Judaism dates from the 3rd to 5th centuries with the compilation of the Babylonian Talmud (Talmud Bavli) with the Sura Academy and the Pumbeditha -- both close to modern day Baghdad and Fallujah
This is the mainstream as opposed to Karaite Judaism or Samaritanism
“technically the Jews aren’t “. Still straining at gnats and swallowing elephants?