The Judeo Christian tradition is based on revelation of an unseen God who enters into covenants with man and nations. This unseen God is a God of Mercy and Forgiveness, a God of Truth and Love, and a God of faithfulness. This faithfulness binds man to the covenant with God.
Greco Roman religions do not have any of these features and tend to be state forms of worship and raise Emporers into Gods. The Gods behave as petty humans with faults, jealousies, failings and amoral behaviour.