The removal of religious doctrine from one's noggin.
A conversation between Dr. Jack the agnostic epistemology
professor and his student:
Dr. Jack: Roni my dear, have you concluded your ecclesiotomy thesis paper?
Roni: Yes professor! My research has convinced me to move out of the rectory
and spread the actual truth.
Dr. Jack: The actual truth?
Roni: Yeah! I can't wait 'till we get to the end of the textbook!
Dr. Jack: Oh dear.