The counter argument claims that religious experiences involve imagination rather than perception, that the object of the experience is not something that exists objectively in the world but rather is something that exists subjectively in the mind of the person having the experience. This suggestion might be supported with an appeal to the possibility of fabricating artificial experiences of God.
A further difficulty is the problem of conflicting experiences: adherents of all religions claim to have had experiences that validate those religions. If any of these appeals to experience is valid, then surely all are. It can‘t be, however, that all of these appeals are valid, because the various religions are mutually inconsistent; they conflict. None of these appeals to experience is valid, therefore.
Objections may also be raised along lines suggested by traditional philosophical scepticism. There are powerful philosophical arguments that our experiences of the external world, i.e. of the familiar everyday objects around us, are insufficient to justify belief in their existence. Descartes‘ argument from dreaming is the best known of these, though external world scepticism can be traced back at least as far as ancient Greece and Pyrrho of Elis.