Gluttony of Cannibals is a ritual in Cult of the Lamb.
Description[]
A Follower is picked as a sacrifice, after which all of the Follower feast upon the hapless being (killing the sacrifice instantly). Several 
Follower Meat are dropped, along with one Sin which is collected automatically. This however, will result in losing 40 Faith from the followers. The Cannibal Trait has no effect on this ritual, and you will still lose Faith regardless on whether or not your Cult has it.