I am going to assume that your question is what is the difference between these two, in which case the answer is relatively simple. A Greek god has its reign over one specific aspect of creation (ie: water, fire, war, etc.), whereas the God of the Hebrews reigns over all creation because He created all of it. Additionally, the Greek gods have human personas and get angry, act capriciously, can be argued with, and take sides in wars. By contrast, the God of the Hebrews is beyond human qualities and is omnibenevolent. There are other smaller differences, but they all revolve around these two points, and I think that if you can understand this one point, it will be pretty easy to understand the rest.
The Hebrews (Jews) had and have only one God, that is why they are called monotheists (mon=one, theos=god). The Greek, on the other hand, had many gods, and that is why they are called polytheists (poly=many). There is no similarity or correspondence between the Greek gods and the Hebrew God.
Jewish traditional holds that the concept of God includes the idea that God protects everyone, not just the Hebrews.
Jewish tradition holds that part of the belief in God includes the idea that God protects everyone, not just the Hebrews.
Yaweh was the god of the hebrews. Emmanuel means god is with us.
Any belief in God requires that God provides for everyone.
Yahweh
If you are asking if the Hebrews were the first people to believe in the existence of one God, the answer is no.
He is Greek god, but he does have a roman version Jupiter
God.
The Jews (formerly called "Hebrews") relate to God through prayer, study, and acts of lovingkindness.
By trusting in God even after the death of her husband, Naomi helped the Hebrews believe more in God.
The god Poseidon was the Greek god of the ocean.