Native has an obvious point. If you believe in a supreme being, you obviously believe in the same supreme being as anyone else who does likewise! Naturally you may have different ideas about him, but two people may have different ideas (including very silly ones) about a mutual acquaintance. St Augustine accepted that those Pagans who believed in a single creator were worshiping the same God as him: it was their worship of other gods as well that troubled him. So, Zoroastrians, Jews, Muslims, Druze, Sikhs, and Bahai are presumably worshiping the same God.
I say presumably, as Yahweh was not originally considered the supreme being (that was El) but just the patron god of the Israelites. Over a couple of centuries, he was gradually "promoted", first to displace the god of this earth, Baal Hadad, and finally to creator status. So, one has to ask whether Jews are worshiping the supreme being under the name Yahweh, or worshiping a minor divinity and passing him off as supreme. I doubt if they know, but if one judges the tree by its fruit, then Amos Oz and Benjamin Netanyahu may be on opposite sides.