Preheat oven to 350F. Grease or spray a standard bread pan. Whisk non-dairy milk and lemon juice together until bubbly and set aside. In a medium mixing bowl, cream pumpkin, sugar, syrup and extract together. In a large bowl, whisk pumpkin pie spice, flour, baking soda and baking powder together. Pour both wet mixtures into dry mixture and stir until just combined. Pour into bread pan, using a spatula to evenly distribute and smooth out the top. Grab a large piece of aluminum foil and make a tent over the pan. Bake for 1 hour, or until a toothpick inserted in the center comes out clean. Once the bread has cooled but is still slightly warm, gently remove it from the pan and on to a serving plate.