Preheat oven to 350 degrees. Combine the graham cracker crumbs, cinnamon, sugar, nutmeg and melted margarine. Stir until blended. Reserve 2 tablespoons of mixture for topping. Press remaining crumbs over bottom and up sides of pie plate. Bake at 350 degrees for 6 minutes. Cool.
In large bowl, combine remaining ingredients except cool whip. Beat 2 minutes at medium speed. Fold in one cup cool whip. Spread in cooled pie crust.
Spread remaining cool whip over filling. Sprinkle with reserved crumbs. Refrigerate at least four hours before serving.