Preheat oven to 325°.
Coat an 8 x 4-inch loaf pan with cooking spray, and dust with breadcrumbs; set pan aside.
Combine water and coffee granules, and set aside.
Combine sugar and eggs in a medium bowl; stir well with a whisk. Add honey and margarine; stir well. Combine flour, baking powder, cinnamon, and salt. Add half of flour mixture to sugar mixture; stir well. Add coffee mixture; stir well. Add remaining flour mixture, and stir just until flour mixture is moist. Stir in walnuts and raisins.
Spoon cake batter into prepared loaf pan, and bake at 325° for 1 hour and 20 minutes or until a wooden pick inserted in center of cake comes out clean. Cool cake in pan 10 minutes on a wire rack, and remove from pan. Cool cake completely on wire rack.