Since a person can not go back into the past to change any action he has performed in our universe, how can we be sure that every choice he makes in his life is not determined in advance by laws which we do not yet know how to formulate?

How do we know he really had a choice?

A/ Popular culture:

> (Merovingian in The Matrix Reloaded, 2003 film)

B/ Bible:

Some people sometimes try to act according to what they themselves recognize as truths and others let themselves be influenced, but we are all victims of causality: 

And he said, I tell thee, Peter, the cock shall not crow this day, until thou shalt thrice deny that thou knowest me (Luke 22:34)

Jesus answered him, Thou wouldest have no power against me, except it were given thee from above (John 19:11)

Let every soul be in subjection to the higher powers: for there is no power but of God; and the powers that be are ordained of God (Romans 13:1)

For whom he foreknew, he also foreordained to be conformed to the image of his Son, that he might be the firstborn among many brethren (Romans 8:29)

For you therefore that believe is the preciousness: but for such as disbelieve, the stone which the builders rejected, the same was made the head of the corner; and, A stone of stumbling, and a rock of offence; for they stumble at the word, being disobedient: whereunto also they were appointed (1 Peter 2:7-8)

For God hath shut up all unto disobedience, that he might have mercy upon all (Romans 11:32)

C/ Myself

I have myself formulated a mathematical model of the physical sciences which is completely deterministic:

https://www.researchgate.net/post/Has_this_interpretation_of_the_Machs_principle_already_been_explored

D/ Why, then, the cinema of life?

Thou foolish one, that which thou thyself sowest is not quickened except it die... So also is the resurrection of the dead. It is sown in corruption; it is raised in incorruption (1 Corinthians 15:36/42)

Because Christ also suffered for sins once, the righteous for the unrighteous, that he might bring us to God; being put to death in the flesh, but made alive in the spirit; in which also he went and preached unto the spirits in prison (1 Peter 3:18-19)

For unto this end was the gospel preached even to the dead, that they might be judged indeed according to men in the flesh, but live according to God in the spirit (1 Peter 4:6)

So Jesus died for the sins of the elect, and the causality that governs the world of the living has cut off the head of John the Baptist.

E/ Is not man in the image of God ?

Knowing that in mathematics the sequences of random numbers are generated by completely deterministic algorithms (all the laws of physics are deterministic according to my model which is opposed to the intrinsic indeterminism of quantum theories), a human being who creates a robot could know everything about its evolution in any circumstance and if he claims the contrary then it must be noted that the reason is the fact that the robot can interact with an environment that the human has not created !

But if we believe that an entity with the faculty of thinking in our image ans called God created the universe in which we live and all that it contains, then no element of the content of this universe evolves in an environment outside the creation of God consequently God knows everything and it is impossible for us to surprise him.

F/ Do we need to suppose that God exists?

This is the minimal hypothesis par excellence. I know that God is the notion of truth (the truth relative to each, Romans 14:23, John 14:6) consequently a scientist who does not firmly believe in God is a little crazy. Wondering what are the holy words or the holy books is another question.