When was Christianity born? When was it that Christianity, born as a particular current within Judaism, constituted itself as a religion different and separate from the Jewish religion? The question has been asked, and the problem has therefore been considered, since the historical-critical investigation of Christian origins began. However the problem has become acute only in the last few decades, because of the occurrence of a whole series of circumstances and of reflections that have deeply changed the historiographic understanding regarding Judaism in the first century, and thus the...