REPCONN test site. The player character will encounter 9-11 various ghouls on the road to the main building itself from Novac and a handful more are located inside the main building.
In and around the outskirts of Camp Searchlight there are quite a few ghouls roaming around but trooper ghouls roaming in the center of the town will not count towards this challenge.
Vault 34 ghouls can be killed to complete this challenge.
Due to the inability to check for other add-ons, A Light Shining in Darkness from Honest Hearts does not count for the challenge despite the religious reference in its name.
Behind the scenes[]
The title of this challenge is a reference to a quote made by Dracula in Castlevania: Symphony of the Night. When accused by Richter Belmont of "stealing men's souls and making them his slaves", Dracula responds by saying "perhaps the same could be said of all religions." Another Gun Runners' Arsenal challenge, You Don't Belong In This World!, references this conversation as well.