Is there a equation here? Of course we have free will, but those choices can only affect certain things. They can't change the laws of physics, or the course of the universe.
Indeed. If free will and random happenings do no occur in nature or society. Why do the laws of physics exist in nature as clearly proven via the scientific method of Objective, Reproducible, constant results via experimentation? Why do laws exist in society if man has no free will to brake them or obey them?
To argue that free will does not exist is to ignore the reality that surrounds you. Poverty exists because of free will. The Christ declared the ".....poor will be among you ALWAYS". Why....because of the random occurrences of both man and nature. Man was born with the ability to make free will choice/decisions...these every day decisions effects life....some people are poor because of illness, injury or just plan laziness....there are things that can't be legislated away.
The God in the Bible certainly as the omnipotent and omnipresent creater can PREDISTINE or PLAN for things to happen along a time line....but that does not infer that no free will exists in either nature or society. God is God.....He makes plans in the past....waits for the future to become the present and then MINIPULATES the natural to achieve His plan. Who is going to stop Him?
The Scriptures explain this.
"Remember the former things (the past) of old; For I am God, and there is none else; I am God and there is none like me,
Declaring the end from the beginning (the future from the past), and from ancient times .....THE THINGS THAT ARE NOT YET DONE (inferring He is planning something in the future), saying MY COUNCIL SHALL STAND, I WILL DO MY PLEASURE." Isaiah 46:9-10
Isaiah goes on to reveal how God called a king from the east to do His bidding of a thing He has promised in the past.....that nation will EXECUTE MY COUNCIL (what God had planned in the past will be put into effect on the day of God's choosing.......God manipulates mankind and nature to do His council when He wants...who is going to stop Him?
Isaiah 46:9-11 Explains how God PREDISTIANES HIS COUNCIL....and still allow both man and nature freedom to abide with the laws that He has established for this realm of reality. The laws of physics and the Laws of Society.....are to be obeyed, but randomness happens depending upon both natural happenstance and the free will choices of mankind.
You can't blame God if you decided to build a breach front house and it was destroyed via natural a event......YOU CHOOSE to build there (a free will choice). God has no respect of person.