[To do this sermon in the best fashion, you'll need a couple things. First, find someone in your congregation or a local baker who will share with you their sourdough starter. A bowl you can use for this sermon will greatly enhance your presentation. Also, to the extent that you can, integrate their sourdough story into your sermon, replacing as much of the story below with their story as you can. Secondly, you'll need one or two bags (per service) of different kinds of bread. The easiest way of doing this I've found is to go to Panera Bread Company (or equivalent), and buy seven or eight loaves of bread – making sure each is a different color, size, and flavor. Or you can have someone in your church make you different kinds of bread, like sourdough pumpernickel, sourdough sweet cinnamon b…