Why was Judaism not a missionary religion?

Answer 1

In fact, Judaism was a missionary religion during the early days of Christianity. We know that Jewish missionaries travelled widely, converting Gentiles. It is believed that in some cases, a missionary would assure potential converts that they need not undergo adult circumcision as long as they believed, but a later missionary would come along and demand to know why the converts were not yet circumcised. We also know that in Medina in the seventh century, Muhammad encountered two tribes that had converted to Judaism. Martin Palmer (the Jesus Sutras) says that from the second century to the twelfth century, Judaism was still an active missionary missionary faith that converted tribes in Arabia and rivalled Christianity in states such as Yemen.