If there is only Yahweh then what about Zeus Or Ares?

Yahweh is one of the English names for the foremost deity of Judaism, Christianity, Islam, and other similar groups. Zeus and Ares are gods in Greek mythology. Zeus was their most prominent god, the god of sky and thunder. Because the Greeks were polytheistic (believed in more than one god), they had other gods as well, including Ares, the god of warfare or bloodthirst. Other major gods of Greek mythology are Poseidon, Demeter, Athena, Dionysus, Hephaestus, Artemis, Apollo, Hermes, Hera, Hestia, Hades, and Aphrodite. In short, the deities you mentioned are from two different religions, one of which is dead.