Do you believe in free will?

[Welsh cake]

God knowing what we will do has nothing to do with Him controlling what we do.

Yes it does. Do you not understand that your concept of God with its attributes of omniscience is basically synonymous with the doctrine of predestination? According to your own theology you have no choice but to believe everything you do or don't do was already decided for you, including this conservation you're having right now.

A man knows that to commit murder means time in jail at the least,

No, he must first be charged with suspicion of murder, then arrested and held in custody, a detention centre, until a trial. If enough evidence is brought against him and he is found guilty of murder in the court of law, he'll then face a prison sentence.

As for the freewill God gives mankind, you have a choice to believe in Him or not, the rest of your life is in God's hands.

Not if predestination is in effect. If God is real and he rewards or punishes based on our actions in this life, then he has already decided before creating reality who he's going to screw over and those he'll make subjects of his 'mercy' i.e. the witnesses who get to watch him screw over the majority of the human race.