Fair enough, not everything has to be 100% realistic. But there are in my opinion better ways to achieve that. I guess the atom-cult was a small wink perphaps to the old Planet of the Apes movies with the mutanted humans that worship a doomsday device of the old world. I think it would have been much better if they actually followed that idea. The doomsday device is as far as I remember stored in some kind of underground vault or something. It was never used during the war or in the past. I mean it's a doomsday device! It would have been awesome if they used an underground missile base as a town, with the nuke ICBM-nuke and it's lunchsilo as temple. It could still have a small part of the town ontop of it or something. It would also make more sense that Burke is searching for someone who can gain access to the silo which would be more guarded.