But your choice is a illusion. It is certain whether contemplation is involved or not.
No you did not but God did and your choices are certain whether you know it or not. Your free will is a illusion.
I do not deny the ability of any being with a higher level of comprehension that I have to be able to discern all of the surrounding influences and deduce from that information what choices I will make throughout my life. I do believe that God, as presented in the Bible, at least minimally qualifies as such a "being with a higher level of comprehension".
I have personally managed to achieve the status of "being with a higher level of comprehension" myself in some cases, specifically dealing with small children, accurately and with certainty discerning their choices before they made them.
Does my foreknowledge of their choices remove their choice? Does it make their choice an illusion?
No and No. The child still has the choice, despite the adult knowing the choice before hand. It it part of how we teach them.
When someone moves from election and predestination by the God based on God's foreknowledge of how His creation started, ran through its cycle and ended into "all is illusion just because He knows" and similar such fatalistic drivel that turns the ones God created in His image into mere automatons, the one moves from "Reformed" to "Frozen Chosen". You have tossed out virtually everything about how believers are supposed to act, the ways in which they show their faith, the fruits they are supposed to produce as followers of Christ.
In fact, by your teaching, you are heading towards (or are already there perhaps) to Antinomianism, because since one has no free will, then why not go out robbing, raping, murdering, tripping little old ladies, taking excretory bodily functions in the middle of the street or any other such thing? After all, it is all illusion, that one has absolutely no free will choice in any of these matters. That one never made a choice, it was all predestined by God and how is one guilty of any offense if it was done (as your theology would require) at the direction of God?
Why? Because if all is illusion, there are no choices, then I HAVE NO EXPLETIVE REASON TO DO ANYTHING THE BIBLE COMMANDS! Nobody does, because there is no choice, we will either do it because our part in this robotic play will script out whether or not we do anything or not.
The greatest of the Reformed teachers have consistently taught that both election/predestination by God and the free will/responsibility of man exists and are relevant. They most definitely do NOT teach that man's free will is illusion.