in 987, Prince Vladimir of Kiev, decided that his realm needed a proper religion. He sent emissaries to neighboring countries to research the religion of that area.
Islam had been dismissed as a choice due to their taboo on alcohol. Judiasm, which had been adopted by the Khazars, was ultimitaly rejected due to the loss of Jerusalem, a sign that they had been abandoned by god. Orthodox Christianity was later chosen, and became a key part of Russian Society.
But what if Prince Vladimir had chosen to adopt Judiasm?