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WI a messiah would come to this world in time of Roman Empire? For the first time, that is.

Would this mean that Judaism would cease to exist and not create it's own state in Mesopotamia? If Judaism ceases to exist what would be the effects of no long Judaic-Zoroastrian clashes? If Zoroastrian isn't forced to constantly fight would it be able to expand into subcontinent, central asia and even further?
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