Another wording is: Did God make us (by His design) totally predictable? Many just assume this, but the Bible suggests otherwise:
"5 The Lord saw how great the wickedness of the human race had become on the earth, and that every inclination of the thoughts of the human heart was only evil all the time.
6 The Lord regretted that he had made human beings on the earth, and his heart was deeply troubled."
So, if this wording is true, as I believe, then it says a fact -- God regretted that He had made humans.
7 So the Lord said, “I will wipe from the face of the earth the human race I have created—and with them the animals, the birds and the creatures that move along the ground—for I regret that I have made them.”
Remember how He made the Earth and all in it? --
31 God saw all that he had made, and it was very good. And there was evening, and there was morning—the sixth day."
So, God made all good, yet later regretted He had made us, and considered to destroy most or all creatures.
This means that by His design God must have chosen to create us to be
unpredictable, and His choices are the best possible choices.
Ergo, for anything good to exist, evil must be possible, and all of it is somewhat unpredictable, even though we could imagine both nature and we are predictable
in part, in aspects, in certain ways -- like the weather -- just not predictable in full "absolute everything".
Ergo it's simply not the case that all is predetermined.
What
is predetermined is that God will accomplish His plans, because He has said He will.
Our redemption into Eternal Life.