WHAT IS biblically predestined?
IF someone is predestined to SIN, how can they be held accountable for that, since an ALMIGHTY GOD is doing it.
Let alone the fact that God is contradicting His own will! God wills that men DO NOT SIN, yet He foreordained it would occur in masses? God wants all to repent and be saved, yet doesnt give everyone repentance and faith?
I will use the term "predetermination", because its the right term, here.
Predetermination to commit a sin is not a robotic programming and poor, innocent man must go and sin. Its the predetermination of time, cicumstances and other variables that together with the man's inner inclination produces the result needed for the best world, which also can mean that a man will sin.
So, God is not doing the sin, the man is. God is just using his tools to make it happen in the way and in the time that is the right for the best interests of all creation.
Predetermination is not a mathematical necessity, i.e. the circle cannot be a square. Its more subtle, about probability and certainity. A sinner is able not to sin, but its certain he will sin, because of his inner inclinations.
Thats why the calvinists had to come up with the "two wills of God" theory.
Its all very complicated and confusing, where is ANY OF THIS in the bible?
Why do you think its very complicated and confusing? Its very natural and you experience it daily.
By the first, preceding will, i.e. by the will without context, you wish to buy a sport car - ferrari. But in the context of your family needs you will buy a more family friendly car, slower, but bigger and generally better for a common good.
God, in His goodnes and character, wants all to be saved. But for the goal of the best possible world He needed to left some unsaved. To ask "where it is in the Bible" is not a very good question, because its an explanation of the Bible verse and we know where the verse is in the Bible.
Also, the concept is not of calvinists, its an ancient thing.