Define "true free will." See, I'm guessing you subscribe to the libertine view that says a decision cannot be perfectly foreknown because if it were that person could not decide otherwise and therefore the decision wasn't really free. This is logical ineptitude at its finest.
God knows everything there is to know. If He says something will come to pass in the future, He will make it come to pass. That might mean some changes along the way (see Saul and Noah for starters).
So God only knows things AFTER they happen. He can say something's going to happen, but He doesn't really KNOW it's going to happen until after He MAKES it happen. It's not really prophecy, just promise.
There is no such thing as free will in modern calvinistic doctrine. Free will is a "divine paradox." It's not free will, but somehow God's not responsible for anything a predestined creature does. Or, it is free will, buuuut not really.
There's no such thing as your definition of free will in Calvinist doctrine. Of course, there's no such thing as your definition of free will in Scripture either. The "divine paradox" of which you speak is quite Scriptural. Your solution to it is to uphold an extreme view of man's will at the expense of God's divine attributes.
God told Adam not to eat of the forbidden fruit, and He meant it. He didn't want Adam to eat it. He didn't program Adam to eat it. He didn't create Adam knowing He WOULD eat it. Why? God is love.
So sings the modernist. Your song is as old as the hills. For God so loved the world that all His other divine attributes disappeared, that all may have truly free will.
Tell me. If God "didn't create Adam knowing He WOULD eat it" why then was Christ chosen before the foundation of the world as the Redeemer? Why is He the Lamb slain from the foundation of the world if the need for a Savior was never known until AFTER the world was created?
Oh, wait...maybe God decided beforehand that there would be a Savior and then kept His promise by adjusting His plan in Eden to make sure there was a need for one so He could fulfill His prophesy promise. Oh...the whole God of love thing. Drat.
How can a preprogrammed creation be individually responsible for anything? Wait! Let me guess your answer: "We can't understand that."
LOL! Please, keep trying to answer for us Calvinists. It's amuzing.
Seriously, please tell me what makes you think Calvinists believe men are pre-programmed? Is it your libertine definition of free will that insists man is pre-programmed if his decisions are foreknown?
"Why is He the Lamb slain from the foundation of the world...."
What is "the world" referred to here? When was it founded?
Here?
Genesis 1
31 Then God saw everything that He had made, and indeed it was very good.
At its foundation, the world was declared "very good" by God.
What world are we talking about? The fallen world, or the world God declared to be very good? Did God declare a wicked, evil, fallen world good? Of course not.
Galatians 1
4 Who gave himself for our sins, that he might deliver us from this present evil world, according to the will of God and our Father:
THIS PRESENT (current) EVIL WORLD.