Add 3 cups of warm water to the cooled oat mixture. Stir in yeast. Begin stirring in flour 1 cup at a time until it begins to get hard to stir. Dredge raisins in flour, and mix with cinnamon; mix into the dough. Turn onto a lightly floured surface, and knead in enough flour to make a soft but not sticky dough. Cover. Let rise for 1 to 2 hours in a warm place, or until dough doubles in size.