Mix margarine, egg, egg whites and vanilla until smooth. In another bowl, combine flour, bran, baking powder and cinnamon. Add to creamed mixture and blend. Add dates, coconut, walnuts and raisins. Mix well. Form dough in roll. Wrap in wax paper and chill or freeze at least 2 hours. Cut roll into slices. Bake on ungreased cookie sheet at 350 degrees for about 15 minutes, or until lightly browned on bottom.