Many Christians and Jews believe that their faiths developed independently from each other, and that their religions are distinct, even antagonistic towards each other. A Portable God dramatically departs from the idea that the birth of Judaism and Christianity are two separate, unrelated events. Judaism and Christianity's origins are not seen as following a linear, chronological process that places the Israelites in the beginning, followed by the Jews, and finally the Christians. On the contrary, A Portable God shows that both Judaism and Christianity emerge from the same religious...