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Judaism was a Dionysus cult that got tied into a Judean identarian movement in Canaan.
The Judeans were originally a subset of Canaanite people, and Hebrew was just a dialect of Canaanite mutually intelligible with the other dialects. They decided to start a regionalist movement because they wanted independence from the other Canaanite tribal leaders. The cult of Dionysus was already somewhat popular in Judea (as it was throughout Greece and other areas of the Mediterranean), so the leaders of Judea decided to make the Dionysian religion a distinctive feature of Judean identity, setting them apart from their Canaanite siblings who still practiced generic Semitic polytheism.
The cult of Dionysus originated in Mesopotamia, near the Zagros Mountains, circa 6000 BC. It spread west alongside winemaking technology. Wherever viticulture appeared, so too did the Dionysian cult. The cultists generally memorized the texts rather than writing them down, because they did not want the common folk to learn of the mysteries (this is why we have very little written material from the Greek mystery cults, for example).
The Judeans were the exception to this rule. They wrote down the ancient Dionysian texts because they wanted to carve their identity "in stone" so to speak. They translated the texts into Hebrew, and translated "Dionysus" as "Yahweh", a minor Canaanite god who ruled over the region of Judea.
Judeans didn't actually come from Mesopatamia, they were of Levantine descent just like all Canaanites. They wewuzzed as Mesopotamians because the Dionysian texts they translated into Hebrew follow the history of the Dionysian cult as it spread out of Mesopotamia, and they wanted to identify themselves with the progenitors of the Dionysus cult.