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The Abrahamic family of religions includes four major branches by the year 800: Judaism, Rahmanism, Christianity and Gnosticism.
As for Judaism itself, there appears to be a diversity of movements within it, which were present by the end of the 8th century. Some of these are difficult to classify, such as Hellenistic Judaism, which, by most part was subsumed by Christianity, or the Hayhanot, a form of Judaic religion practiced by the Beta Israel community in Semien.
The majority of Jewish populations, however belonged to the Rabbinical Judaism. They could have been found throughout the extent of the Roman Empire, differing by their geographic, and by now, also cultural affiliation into Ashkenazi (Francia), Sephardi (Hispania), Italkim (Italy), Romaniot (Rhomaic Empire), Mizraim (Egypt) and Bavlin (Mesopotamia). Furthermore, there were some Jewish tribes in Arabia as well (mostly in Hejaz, but also in Najd). A small community aslo exists in the ancestral lands (1)
Rabbinnical Judaism emerged after the destruction of the Second Temple, and most of its practices could be traced to Pharisees: a definite separation with Christianity occured at the Council of Jamnia.
Ideally, the religious head of the Jews would be the Sanhedrin and the High Priest. In the southern Levant, the institution of the Sanhedrin was revived by the Banu Judham, yet its influence was restricted only to religious affaris. Its chief was known as nasi. The authority of the Sanhedrin was extended to encompass the entirety of the Ghassanid kingdom after their conquest of Jerusalem, and also by extension it became a chief authority for the Jewish tribes of desert Arabia.
Politically, and institutionally, the Jewry of Mesopotamia was answering to the Exilarch, who would reside in Nehardea. The Jews who lived outside the Levant and Mesopotoamia would depend onj their rabbis to interpret the Torah.
The Jews of Yemen, were, however of the Saduccee denomination.
Significant is also the Jewish settlement of Khazaria. However, it remains unknown whether there existed a structured hierarchy and organized religious life in the khaganate.
The origins of the Karaite community are unknown: it may be possible, that they have already been present in Mesopotamia by this period.
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Autocephaly map of Rabbinical Judaism. Blue areas have no centralised authority