How was Judaism spread?
November 22, 2016 6:57PM
1) As the Jewish communities spread and moved. This phenomenon
was set in motion by the various expulsions and persecutions, which
drove Jewish populations to settle in new places.
2) As non-Jews came in contact with Jews, there was a degree of influence upon them. Ancient writers speak of large numbers of people in the Mediterranean area who had taken on various Jewish practices. Through them were spread those beliefs which they had adopted directly from Jewish sources, such as the prohibition of infanticide and human sacrifice.
See also the Related Links.
Judaism is not a missionary religion, so it didn't spread by conversion. Though people can convert to Judaism, converts are not sought and most people don't do it because anti semitism tends to explode every few decades and you don't want to be caught Jewish when that happens. So in terms of physical growth of the Judaism, it generally happened through having babies.
If you're asking how Jewish ideas and influence spread, the answer would be exile. Jews were exiled from Israel first in 597BCE and then again in 70CE. From there, they were spread out to the whole world, and so were their ideas.