Jews believe in a single, indivisible God-creator, who had chosen the People of Israel to be its instrument upon the Earth (note that a "chosen" people does not necessarily mean "better" than anyone else), and formed a Covenant with them in exchange for their worship. It's catechism is "Hear, O Israel: the Lord is your God, the Lord is One".
There are different strains of Judaism as with every major faith, but this is the basic tenets that probably everyone will agree upon.
one.
They don't, the Jews only believe in one God.
Jews believe in One God, who created the universe. He is omnipotent. The words "What Jewish god" (in the question) are inapplicable, since we don't believe in "gods."
Judaism is monotheistic meaning that we only believe in one God, The Creator.
Some believe in certain gods, some believe in other gods, some believe in no gods, some believe in all the gods.
the Jews believe in only one God. They call him Jehovah. Judeaism is very close to Christianity
Some believe in certain gods, some believe in other gods, some believe in all the gods, some believe in no gods.
Gods.
There are many Greek gods and goddesses of nature (both of earth and human); there is only one God in Christian/Jewish belief.
Gods believe in themselves
There is no such Jewish concept.
Most humans believe in either one single God or a number of gods.