I don't follow your reasoning.All things are predestined to occur as God has known they would occur. In other words, if God knew before you were born that you would be saved then your salvation is predetermined. If God knew before Rudolf Carnap was born that he would reject Christ and die an atheist, then his damnation was predetermined
Since God knows all that will happen, everything that happens is therefore predetermined?
Predetermined necessarily implies a 'predeterminer'. Who/what is this predeterminer?