This Freakonomics podcast had an interesting discussion about a guy who challenged an atheist to sell his soul. The guy who bought claimed to be a Christian. The trope, of course, goes back a long way - its not called a Faustian bargain for nothing.
The question, however, is this. Is a man's soul something that belongs to him in the first place? Leaving aside for a minute that of the redeemed--namely those "bought by the blood of Christ," I wonder if the unsaved actually have possession of their own soul, and if so, if they would have rights to transfer it to another.
If not, then it would beg the question, what right does God have to redeem it. Own it, I could understand, since he made it--but how could he transfer it from someone else?
If a person does own their own soul, what is the mechanism by which it can be transferred? How would one know? What rights would adhere thereto?
In other words, does Faust actually make sense in Christian framework?