As a visitor, you can look around the....beautifully horrifying church! With skulls, creatures, and rats. You even get greeted with a hand that will pick you up and...well, drag you down. If you are either guided or find a very 'special' place, you can join. Very simple, but sadly, I cannot say more.
Amazing gameplay was dazzled at first as I studied everything. When you aren't fighting, you can notice the lovely things.
As a raider, you can talk with other raiders and attack the church. You don't really do that much, though.
Alright gameplay, the creatures probably have something to do with that.