Many polytheists would be perfectly happy to borrow yet another god from Christianity, but only so long as they could demote Him from the One God to a god among gods: “What have you got against the others?” The naïve assumption is that God belongs to the genus “gods” – that He is just one more of those things (but in Christian belief, the real one). St. Thomas has argued that He is not that sort of thing at all – in fact, He is not a “sort of thing.” Moreover He is of such a nature that there could not be more than of Him. But how do we know He is one? Even someone who considers the many gods of polytheism false, foolish, base, demonic, or all too human may ask, “But is monotheism true?”