Judaism is the twelfth-largest organized religion. It is one of the first recorded monotheistic faiths and one of the oldest religious traditions still practiced today.
The Jewish faith is centered around the worship of their god, Yahweh, as described in the Jewish Bible. The Jews use what Christians refer to as the Old Testament, with the first five books making up the Pentateuch. Christianity is an offshoot of Judaism.
Whereas Christianity is split into various differing sects with differing views about basic philosophical premises, Jews are largely divided into denominations based on how strongly they follow traditional Jewish law. The main denominations are Orthodox, Conservative, and Reform, in decreasing order of severity.