Many theists claim that their god revealed himself to them and that this is reason to believe. But many other theists believe that their version of god, which contradicts the other theists' version of god, revealed himself to them. Both groups of theists cannot be correct. Also, many psychotic people claim to hear voices and see magical things and their claims are no less credible than the theists' claims. Since we know that psychology can explain some of these revelations, it is much more sensible to conclude that they are all psychological phenomena than to assume that some revelations are genuinely magical.
Christians claim that the Bible is divinely revealed and that the Bible is evidence for their god.
But the Bible is self-contradictory and it states in no uncertain terms that the Earth is flat . It is not reasonable to argue that a book filled with such errors provides evidence for the existence of God. In fact, it can be reasonably argued that the errancy of the Bible is evidence that the Christian god does not exist. Furthermore, the god described in the Bible is an abhorrent monster that ordered mass murder and approved of rape and slavery. Ontological Arguments Ontological arguments are really nothing more than silly word games.