I see two alternatives: 1)God had no idea a particular sin would occur, or 2)God had no choice but to allow a particular sin to occur. You can choose Open Theism or the God that isn't God.
I did not say this at all. What I said was Calvinism teaches that God predestined/foreordained all sin. I have no real problem with foreknowledge of God, nor do I have a problem with the idea that there were some sins that God did predestine/foreordain which were necessary to fulfill prophesies or to accomplish his ultimate will for mankind. That is far different than saying God predestined/foreordained all sin. I stongly believe that God is God. I also believe that there is no real possibilityu of a love relationship if the object of our love has no ability to reject the love offered.