KC:D is set to high Middle-ages - a thoroughly Christian society.
I have not heard a single bell sound for the whole game (maybe during the Skalitz raid at the beginning, can not really re-call )
But: morning, mid-day and evening bells should be heard regularly around towns / villages with churches (if they are wealthy enough, the bell sound should be heard for miles around even).
Unregularly, there should be funeral tolls for sure as well (i.e. if you kill anybody from around town, or if there is some corpse found and reported earlier etc.)