Perhaps, however, an even more narrowly restricted principle would do the trick: whenever the assumption that a positive existential claim is true would lead one to expect to have grounds for its truth, the absence of such grounds is a good reason to believe that the claim is false. It might then be argued that (i) a God would be likely to provide us with convincing evidence of Her existence and so (ii) the absence of such evidence is a good reason to believe that God does not exist. This transf