I'm really not interested in what the Catholic Church in the Middle Ages had to say no matter how "attractive" it was. By then the Church's doctrine was corrupted beyond repair. Many of these men were caught up in Renaissance gibberish of the day with man the center of attention and free will the focus. Man was the captain of their souls. Their church doctrine was corrupted by their philosophical views. They simply disregarded clear text like "elect", "chosen", and "predestined" to remake God in their image. They ignored the entire story of Israel being the "chosen" race. The semi-Pelagius view that fester in the Church for over a thousand year found root and flourished.
Unfortunately for the Church, God raised up Luther, Calvin and a few others to keep His remnant on track. He provided the scriptures to all men so that man may have His divine word, not given in piece meal as the Church was prone to do.
Yes, most people today (Protestants included) believe in the free will of man. They are wrong. It is a denial of God's gift of faith to us. It is a denial that all souls belong to God and He can do with them what He wishes.
You may or may not be interested in the idea that man indeed has free will. You may or may not be interested in the idea that man has responsibility for his everlasting destination.
You may have reason to furiously defend the robot slave theory, but I suspect that it is because you believe that you are one of the elitist elect and none of the rest of us can get into your undeserved club.