In my opinion, conversion is the right word to use for Paul’s rejection of Judaism and turning to the faith of the Christian community he had been persecuting. But I do not think that it is correct to say that he converted to a new religion or that Paul himself would ever have thought so. Christianity, for Paul, is nothing other than the faith of his ancestors come to an eschatological phase of fulfillment before the final consummation. The Christian community is the true Israel, if not the new Israel.