Yes, I know the setting is hell, but really? You're going to feel up some demon's breast before killing it?
I find the tiny iota of culture in that game to be slightly above Duke finding a giant three-breasted alien and saying "Yeah, I'd still tap that" before killing it. Killing unbaptized babies does come pretty far down the line, though, regardless of it being present in the original Divine Comedy (the "unbaptized babies" part, not the "killing them" part.)
Edit: Oh, and the unbaptized babies coming out of giant demon nipples. That's pretty tasteless, too. They're damn near neck-and-neck.