“Build your own bestseller: three idiot-proof formulas” by Noreen Malone at The New Republic‘s site.
But there’s a better way, actually. Just have a near-death experience, pretend you went to heaven and saw Jesus, leaven the narrative with some juicy details about what heaven is like (How tall is Jesus? Are there cats up there? What do they eat?), and you’re golden. There’s nothing the public likes better than Proof of Heaven.