"Your faith shackles you my friend, your god is little more than a lamed hog, spitting awfull at mankind, we need a new deity, one of steam and the wheel, and I intend to take the problems we face today and smother it with steam!"
'A Machine For Pigs' could only be an allusion to both slaughterhouses and industrialization. A church that has a crucified pig in place of Jesus confirms that this theme will run through the entire game.
I think in a series like Silent Hill where human interaction is a bigger component and it's tone more black & white you see overt occultism. There's a direct correlation to Hell there because the torture of each individual drawn to the town, and subsequently shaped into monsters, is ongoing and eternal. Unlike Silent Hill though, a real place shaped and obfuscated by the mind, Amnesia seems to take place entirely in the mind. Amnesia isn't bound by rules the way Silent Hill is, it's pure surrealism. The idea that you'd meet another person in the series, let alone a group of people worshiping anything, seems unlikely in a world they've set up governed by a blue-orange morality system. Like an H.P. Lovecraft story it's very alien and haunted. Anything in the series cannot be taken at face value because you're in a realm of the mind. Everything seen there is through a layer of nightmare logic. So 'pigs' in this case becomes less an actual animal and more a recurring symbolic motif of the violence human beings are capable of and how that relates to our nature and society.
... In a year of amazing games this one is going to blow people away.