the FAITH games are so fucking cool. they're incredibly unique in basically every way... and very terrifying.
this video is LONG but it's a fantastic explanation of the unholy trinity.
something cool i learned from this is that airdorf, the creator of the game (solo dev btw), was actually a missionary and included a personal story from his mission in the game. i could always tell that FAITH was a game that was made by someone who actually had a lot of knowledge about Christianity and there was always a sort of reverence for it that could be felt, which can't be said for pretty much every other example of exorcist-horror out there.