Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x5-inch loaf pan.

Stir together bananas, pumpkin, honey, sugar, vegetable oil, and eggs in a large bowl. Combine flour, pie spice, baking powder, baking soda, cinnamon, and salt in a separate bowl. Stir flour mixture into banana mixture until just combined. Fold in raisins and walnuts. Pour batter into the prepared pan.

Bake in the preheated oven until a toothpick inserted into the center of the loaf comes out clean, about 45 minutes. Cool loaf in the pan for 10 minutes before transferring to a wire rack to cool completely.