How do the greco-roman civilization compare to judeo-christian tradition

Judeo-Christian belief was based on monotheism, a belief in only one god whereas; Greco-Roman belief was based on polytheism, belief in many gods. This is one of the basic differences.

The Greco-Roman traditions in general assumed there to be a patron god for each city, something which a monotheistic religion could not offer. However, Christianity came up with the concept of a patron saint for each city.