There is no true belief. Unless they are delusional, they cannot force themselves to believe something as fantastic as a supernatural, omniscient deity. All of their posturing and polished, well rehearsed retorts are just that, and under even mid level observation, do not hold up. The theist then becomes an intentional liar, skewing the truth to attempt to hold on to that shard of "perhaps" they have tucked deep inside their mind, and even the over educated theologians struggle with the existence of a god, many abandoning it completely for long periods of time.