Compare what is written about Zeus in Greek mythology and about God in the Bible. From what is written, it can be seen they are two very different beings. Salvation for humans, or calling humans to love one another (or even himself) was never a part of his story. His story is about maintaining his own power, his own desires--and he pretty much ignores humans except for the few times they can be used to further his own powers/desires among the gods.
The Bible teaches God is One, no other like him, that he alone is the almighty. God cares about humanity, about redeeming them and opening up the Way of Salvation. God fights for us, not for himself. He calls us to love one another. He calls people to put Him first. Zeus never cared if people put him first or not--nor called for them to do so.
Faith requires belief based on reason and logic. And, by reason and logic, I have shown Zeus and God to be two different beings.