In a large mixing bowl cream both packages of cream cheese until smooth.
Add the liquid sweetener and continue mixing.
Add 1/2 cup of the cool whip and continue beating on low speed until smooth and fluffy.
Fold in 3/4 cup of the chilled stewed rhubarb (rhubarb sauce).
Continue gently mixing, by hand, until thoroughly combined.
Add sliced strawberries and mix them in gently, until thoroughly mixed.
Fold in the remaining cool whip, gently mixing.
Pour into the cooled crust and smooth the top.
Chill for at least 2 hours before serving.