"Killing doubt that has been projected
into the non-believer."
(Final Solution V)

Non-belief or disbelief symbolizes doubt or lack of faith. The non-believer projects his own doubt or disbelief into the non-believer. This is the part of himself that lacks faith in the existence of the omnipotent object. The non-believer's doubt torments the believer.

The believer needs to kill or kill off his own doubt, which has been projected into the non-believer.