Butter the 10 inch pie plate to prepare for the crust.
Combine cranberries, sugar, and water in a medium saucepan; bring to a boil, stirring often to dissolve sugar.
Reduce heat and simmer cranberries for about 15 minutes until thickened, stirring frequently to prevent scorching.
Remove the cranberry mixture from heat and puree in a blender or food processor; chill the puree.
Mix gingersnap crumbs with melted butter and press evenly into the pie plate; refrigerate while continuing.
Beat the chilled cranberry puree with cream cheese and vanilla paste until smooth and lump-free.
Fold whipped topping gently into the cranberry mixture until fully combined.
Spread the cranberry mousse over the chilled gingersnap crust evenly.
Chill the pie for several hours or overnight to set and enhance sliceability.
Garnish with whipped topping, sugared cranberries, and mint leaves before serving.