Cut squash in half crosswise; remove seeds. Place, cut-side down, in 13X9-inch baking dish in 1/2-inch depth water. Bake at 400°F for 40 to 45 minutes or until tender. Cool slightly.
Scoop cooked squash out of shells, leaving 1/4-inch thick shell; reserve shells. Mix squash, apples, apple juice, margarine, brown sugar, lemon juice and cinnamon. Stir in crackers and raisins. Spoon squash mixture into shells.
Bake at 400°F for 10 minutes or until thoroughly heated.