There is no real "Judeo-Christian" ethic. These two religions do
share some common literature, but the basis of Jewish and
Christian ethics are not the same. Please note, I'm not saying
one is superior to the other or that any group is any more holy.
They are just different.  Jewish ethics are based on a covenent
with God. This covenent was sealed on Mount Sinai and is spelled
out in the Book of Exodus. God decided that the Jews would be
his people, and he would be their god. They (the Jews) would
also have to follow a set of rules, namely The Ten Commandments.
These rules spell out several activities that Jews were
forbidden to do. For example, the Jews were not allowed to
murder, commit adultery, steal, worship other gods, create or
worship idols, bear false witness, work on the sabbath, or use
the name of god in vain. They also had to honor their parents.
All ten commandments deal with human behavior in some way, and
this is the split between the two sets of ethics.  Typically,
Christian ethics do not invo