That would all be true if cognitive dissonance did not exist.  You assume that I can't hold two contradictory beliefs in my mind simultaneously.  My body and brain will always operate on materialistic principles because I have to assume my fingers exist before I can type with them, but my soul is still a solipsist.  Being able to alternate between belief systems is the only way I can get through my day-to-day life as a physics student, during which I see myself as more of an automaton.