Salaam Arman,
I am convinced that the quran we have today (in it's totality) is "speaking" the truth.
No. But don't stop reading 
This is how I see it.
When you where born God knows that you have a maximum of 200 years to live if you live in the perfect way.
Every cigarette you smoke there will go 1 minute off from your optimal lifespan.
And so with every action.
Thus yes He knows your optimal lifespan but not when you will die, as it's your choice to smoke or not to smoke, of course UNLESS He speaks His word over you that you will die on time x, then you are predestinated.
If you think that God knows when you will die, then why will you take your son or daughter or mother or father or whoever to a doctor to heal him/her.
The doctor is useless, if God has determined that your son will live 87 years than it is even not needed to feed him when he is just a baby. God's word is will and if He decided 87 years of life for you son than do not feed him or take him to a doctor, God will take care of him and he will survive till he reaches 87.
Salam Bender.
[
Salam Brother Someone? this reply applies for you as well.]
The way I see it is - your views do not add up with the following verses of Qur?an:
3:154 (And) later, from after the distress, He sent down upon you security ? slumber veiled a faction of you while certainly a faction themselves made their souls anxious believing about God beyond the truth ?assumptions of ignorance ? saying, ?Is there anything for us from the command?? Say, ?Indeed the command ? all of it ? is for God?. They hide in their souls what they do not make apparent to you. They say, ?If there happened to be anything for us in the command we would not have been killed here.? Say, ?If you happened to be in your houses, those upon whom murder was booked would have surely come out towards their death-beds.? And so that God could test what was in your breasts and that He might purge what was in your hearts, and God is Knowledgeable of what (you) have in the breast.
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10:49 Say, ?I neither have power to harm my soul, nor to benefit (it) ? except whatever God wills. For every community there is a term ? so when comes their term there is no delaying by an hour, nor is there any advancing of it.?
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7:185 Do they not watch over the empire of the heavens and the earth ? and whatever God has created of things ? and perhaps that their term has actually come near? So, in what narrative (حَدِيثٍ) after this will they put faith?
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31:34 Indeed God ? with Him is the knowledge of the hour. And He sends down the rain ? and knows what is in the wombs. And no soul can figure what it will earn tomorrow and no soul figures in which land it will die. Indeed Allah is Knowledgeable, Aware.
(My personal translation, cross checking is recommended, emphasis added.)
Especially if one takes your understanding, the claim in 3:154 appears like an empty threat. In fact if I go by your logic our birth is also not decided by God ? it all depends on whether our parents chose to mate etc. Exalted be He! Above what they imply of Him.
By the way why are we going to hell if you murder someone? When you stand before Allah, you can defend yourself with:
"well I was just helping you God.
I killed him when he was 35 years old and because the poor guy indeed died means that you already had determined that the poor guy will day at 35.
So I do not understand why you are judging me God, I was just helping you. I am killing in Your name."
I know that for some my view on this is shocking as this makes Allah not almighty according to some, but this is not the case.
Almighty is when you can do whatever you will without limits. And that is Allah, He does what He wills, that is Al Mighty.
I think you missed the point. Of course He can give me a brain damage or make me a zombie so that I will loose even to a frog. That is not the question I am asking.
I have clarified my understanding before, doing so once again, perchance someone listens.
Our parents do not create us or determine our birth. It is God who decides when each of us will come to the world. Our Parents just play along God?s will to earn the right of playing the role of parents, which too is predetermined for them. That is why our obligation to God supersedes our obligation to our parents.
The food that we eat is not ?produced? by us. Allah produces everything. We merely toil in the land and seas to earn our living which has been predestined. That is why we eat everything in the name of God.
When our children become sick and we go to the doctor, we are not fighting against death. We are merely playing our role predetermined by God to earn our satisfaction that we tried our best. That is why when our children die in spite of our best effort we have to accept the fate graciously.
Similarly when we earn the destination of the Garden or the Fire, we are not creating our destiny. We are merely earning our destiny. Guidance is only with God. He guides to the straight way whomever He wills.
Of course there will be people who will claim on the day of rising that they only executed God?s will. So did Iblis when he says? ?because you let me astray? (Ref: 7:16)?. But their execuse will not hold any water. While God determined our destiny (including that of Iblis)
He gave us the free will to earn that destiny. We are responsible for how we excercised that free will? not the outcome thereof. And God is not unjust by an atom?s weight.
I have a couple of verses for you:
3:140 إِن يَمْسَسْكُمْ قَرْحٌ فَقَدْ مَسَّ الْقَوْمَ قَرْحٌ مِّثْلُهُ ۚ وَتِلْكَ الْأَيَّامُ نُدَاوِلُهَا بَيْنَ النَّاسِ وَلِيَعْلَمَ اللَّـهُ الَّذِينَ آمَنُوا وَيَتَّخِذَ مِنكُمْ شُهَدَاءَ ۗ وَاللَّـهُ لَا يُحِبُّ الظَّالِمِينَ
3:166 وَمَا أَصَابَكُمْ يَوْمَ الْتَقَى الْجَمْعَانِ فَبِإِذْنِ اللَّـهِ وَلِيَعْلَمَ الْمُؤْمِنِينَ
3:167 وَلِيَعْلَمَ الَّذِينَ نَافَقُوا ۚ وَقِيلَ لَهُمْ تَعَالَوْا قَاتِلُوا فِي سَبِيلِ اللَّـهِ أَوِ ادْفَعُوا ۖ قَالُوا لَوْ نَعْلَمُ قِتَالًا لَّاتَّبَعْنَاكُمْ ۗ هُمْ لِلْكُفْرِ يَوْمَئِذٍ أَقْرَبُ مِنْهُمْ لِلْإِيمَانِ ۚ يَقُولُونَ بِأَفْوَاهِهِم مَّا لَيْسَ فِي قُلُوبِهِمْ ۗ وَاللَّـهُ أَعْلَمُ بِمَا يَكْتُمُونَ
57:25 لَقَدْ أَرْسَلْنَا رُسُلَنَا بِالْبَيِّنَاتِ وَأَنزَلْنَا مَعَهُمُ الْكِتَابَ وَالْمِيزَانَ لِيَقُومَ النَّاسُ بِالْقِسْطِ ۖ وَأَنزَلْنَا الْحَدِيدَ فِيهِ بَأْسٌ شَدِيدٌ وَمَنَافِعُ لِلنَّاسِ وَلِيَعْلَمَ اللَّـهُ مَن يَنصُرُهُ وَرُسُلَهُ بِالْغَيْبِ ۚ إِنَّ اللَّـهَ قَوِيٌّ عَزِيزٌ
20:38 فَقُولَا لَهُ قَوْلًا لَّيِّنًا لَّعَلَّهُ يَتَذَكَّرُ أَوْ يَخْشَىٰ
And there are so many many more verses like this.
And think about the messengers, think about all the inspirations you get daily.
The word ?وَلِيَعْلَمَ? can be translated as ?And to know..? as well as ?And to make known...?. Shahih International follows the second meaning in their translation, for example. I accept the second understanding for these verses because that is the only understanding which is consistent with other verses in Qur'an. God does not need to know anything. He knows what is in our hearts. But He creates the tests so that we can know ourselves what we actually stand for. And so that we can earn our destiny.
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I know that most people of the world will remain confused about predestination because we humans are too arrogant to let go the notion that at the end of the day we are in control. Generally I try to ignore this debate? because this is not so much a question of understanding that can be explained, this is more of a question of humility ? on which we have to put Faith.
The God that I am slave to is not an entity existing In parallel to the entities of this universe ? playing with them some power game. God is the authority that is the ultimate Originator of every bit of information that makes up the universe? He Originates and sustains all matters, all energy, all senses and all consciousness. He is the One who feeds and is not fed (Ref: 6:14). This feeding is not merely in terms of food ? it is in terms of information / decision as well. No one takes a decision and feeds back to God ? it is He who takes all decisions and feeds back to each of the pockets of consciousness that He himself originated. To each of these individual pockets of consciousness (which are we) it appears that they are taking these decisions, but in reality they are merely quarantined parts of the ever flowing consciousness Which has caused the universe to be and Which owns the existence, the actions and destinations of each of those pockets with absolute authority. So, it is not a question for me whether I have a free will independent of God - rather, I submit only to the authority who is driving my conscious experience including my free will. Call Him God, call Him Allah, call Him the Almighty, call Him the Brahman, or call Him the Spirit of the universe ? to that Supreme Authority I am slave to and to Him will I return.
With this I rest my case. May Allah guide us all to the straight way.
Arman