One alternate option which I thought of for Deathfire is if we spare him tonight, and promise to take him to the end. From there, for are Night 2 deathnote, we claim that we jailed Lucifer N1, and that if Jesus reveals himself, we can easily score a Humanity-Roman-Eternity victory. With Deathfires help, it could work. If we manage to lynch Jesus D3, we can easily win with sin.
It may not work, but I'm making sure we know all the options. Would like to hear feedback before I make an absolute final desicion.
Edit: This was just to make sure we knew all are options. I'm just about to order Deathfires executuion