Carrier is another guy who's books I'd like to get into at some point. He's definitely a smart fellow. In terms of the mystery cults, what we know about them, and Marcion's role in shaping 'mainstream' Christian thought, how much of this is based on hard evidence--that is , direct sources--rather than speculation and theorizing?
He who loves God cannot endeavour that God should love him in return - Baruch Spinoza