I wouldn't have used the words "messianic language". I'd use the words "black and white thinking". While dividing the world into a rigid good versus evil certainly has its place: "Thou shalt not kill", for example --- although even there there are all sorts of gradations for things like capital punishment, just war theory, etc --- the use of a rigid black and white thinking is what I think is wrong with the Tea Party and Republican Party, just as I think it's what's wrong with the FSF and Stallman's view of the world.
You can't really argue about axioms, though. There's no way you can address the core issues of RMS's position, because it's a religious issue. Either God exists or it does not. Either the Flying Spaghetti Monster exists or it does not. I happen to believe the first, and not the second, but I also believe that I can never convince anyone about that using reasoned argument, because fundamentally you can't prove or disprove axioms. You can prove or disprove what follows from a commonly held set of axioms, but that's a different story.
You can't really argue about axioms, though. There's no way you can address the core issues of RMS's position, because it's a religious issue. Either God exists or it does not. Either the Flying Spaghetti Monster exists or it does not. I happen to believe the first, and not the second, but I also believe that I can never convince anyone about that using reasoned argument, because fundamentally you can't prove or disprove axioms. You can prove or disprove what follows from a commonly held set of axioms, but that's a different story.