***** [Nashville] [formal banquet hall] [James Dobson and John Piper share the stage; a who’s who of Christian culture is gathered in the audience] JAMES DOBSON: [at the podium] Hello and welcome.  I will be your [squints at notes] ROAST-MASTER for tonight.  And…I suppose it will fun…and light-hearted…and various other things. [one person claps in