3.31 Speculations II: 50-66 CE

This is the second episode in a series of speculations and alternate histories. This time:  What if Christian missionaries had never preached to the pagans? Second, what may happened if Christian missionaries had ignored the Roman empire, and proselytised in Parthia, instead? Third, what would have become of Christianity if the Jewish revolts had never occurred, and the Temple stood to the end of the empire?