Ahh yes, FEAR, one of my favorite video games. I also loved its precursor, Blood.
There was also a game that preceeded Blood, that was even weirder, and featured many of the same concepts, like armed cult monks, etcc... but had some super mario elements - seriously - with strange power ups like glowing mushrooms. I believe that it also had the first instance of "guns akimbo" in a video game. Wish I could remember what it was called.