Combine cookie crumbs and margarine; press onto bottom of 9-inch springform pan.
Soften gelatin in water; stir over low heat until dissolved.
Combine cream cheese and sugar, mixing at medium speed on an electric mixer until well blended. Gradually add gelatin mixture and milk, mixing until well blended.
Chill until mixture is thickened but not set.
Fold in whipped cream.
Reserve 1 1/2 cup cream cheese mixture; pour remaining cream cheese mixture over crust.
Top with cookies and reserved cream cheese mixture. Chill until firm.