It is reasonable to expect that a skeptic will feel free to use as a basis for action any ideas that are shown to meet his criteria of legitimacy. On this basis, there is not only one, but several proofs for the existence of G-d and, as mentioned, there is no problem if one is forced to say that this existence is not grasped by the senses or the mind, or even if it contradicts rationality. As long as this existence accounts for observed reality and does so better than any other proposition, we have what is usually considered to be conclusive, scientific proof.