Preheat oven to 350 degrees. For batter, cream margarine and sugar. Add eggs and beat well. Add dry ingredients. Stir to combine. Spread two third of batter into flat bottom of springform pan. Blend cheese filling ingredients. Spread evenly over batter. Spread remaining batter on top. Mix the streusel topping to a coarse crumb texture. Sprinkle the streusel on top. Bake for 45 minutes.