That's not satanic, that's gothic! If I dye my hair black, get a bunch of piercings and tatoos, and never go outside so my skin turns completely pale does that make me satanic? No it makes me look gothic! I can still be a christian while looking like that! I have no idea what you're talking about with the medic thing, but I guess that would be a tortured woman, not tortured women. Come on, these characters are while admittedly a little sick, are nothing to freak out about! If you wanna play as one of those characters go ahead, but the game isn't a story driven thing, you never have to know about that stuff you just said unless you read all the character's desciptions (I didn't even know about it until you just mentioned it). And besides the demo doesn't have any of those things in it! You can only play as four characters I think (at least that's how it was in the old demo). The game is very much a work of art, all the characters and levels reflect that, and there is nothing in them that would affiliate them with satan!
I guess if you don't like it don't play it, but it doesn't have satanic things like that in it.