Stir flour, baking powder, salt, baking soda and raisins together. Separately, fork-blend eggs and buttermilk, then add to dry ingredients. Stir until sticky batter is formed. Scrape batter onto well-floured surface and knead lightly.
Shape batter into ball, then place in round non-stick casserole that has been sprayed with cooking spray. Mark a cross in the center using a sharp knife.
Bake uncovered in preheated 350-degree oven for about 1 ¼ hours. Wait 10-15 minutes before attempting to remove bread from casserole, then cool on wire rack. If desired, cut loaf into quarters and then slice thinly.
