Analysis of information sources in references of the Wikipedia article "Second Temple Judaism" in English language version.
The people did not spread, but the Jewish religion spread. Judaism was a converting religion. Contrary to popular opinion, in early Judaism there was a great thirst to convert others. The Hasmoneans were the first to begin to produce large numbers of Jews through mass conversion, under the influence of Hellenism. The conversions between the Hasmonean Revolt and Bar Kochba's rebellion are what prepared the ground for the subsequent, wide-spread dissemination of Christianity. After the victory of Christianity in the 4th century, the momentum of conversion was stopped in the Christian world, and there was a steep drop in the number of Jews. Presumably many of the Jews who appeared around the Mediterranean became Christians. But then Judaism started to permeate other regions – pagan regions, for example, such as Yemen and North Africa. Had Judaism not continued to advance at that stage and had it not continued to convert people in the pagan world, we would have remained a completely marginal religion, if we survived at all.
The people did not spread, but the Jewish religion spread. Judaism was a converting religion. Contrary to popular opinion, in early Judaism there was a great thirst to convert others. The Hasmoneans were the first to begin to produce large numbers of Jews through mass conversion, under the influence of Hellenism. The conversions between the Hasmonean Revolt and Bar Kochba's rebellion are what prepared the ground for the subsequent, wide-spread dissemination of Christianity. After the victory of Christianity in the 4th century, the momentum of conversion was stopped in the Christian world, and there was a steep drop in the number of Jews. Presumably many of the Jews who appeared around the Mediterranean became Christians. But then Judaism started to permeate other regions – pagan regions, for example, such as Yemen and North Africa. Had Judaism not continued to advance at that stage and had it not continued to convert people in the pagan world, we would have remained a completely marginal religion, if we survived at all.