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.