> If the Old Testament is really as bad as people say then Judaism really has a problem. But in my experience Jews aren't any more violent than Christians.

Judaism has also developed a lot since antiquity. After the destruction of the Second Temple in 70 AD, it developed into Rabbinic Judaism with a number of rabbis creating authoritative interpretations of the Halacha, or Jewish law. One such famous rabbi was Maimonides who lived in the 12th century.