Carrot 'n' Raisin Cheesecake

1 cup graham cracker crumbs
3 tablespoons granulated sugar
3 tablespoons margarine, melted
24 ounces cream cheese, softened
1/2 cup granulated sugar
1/2 cup unbleached all-purpose flour
4 large eggs
1/4 cup unsweetened orange juice
1 cup finely shredded carrot
1/4 cup raisins
1/4 teaspoon ground nutmeg
1/4 teaspoon ground ginger
1 cup sifted confectioners