Does Islamic/Christian God really exist?

Following argument requires rational thinking (use of reason), and faith doesn’t qualify. So, illogical people stay out of it, lolzz. 8-P

First of all I would like to define a few things:
Omniscience: Perfect knowledge of past and future events.
Free will: Freedom to choose between alternatives without external coercion.
Paradox: Statements or events that have contradictory and inconsistent properties.

Proposal:
Islam/Christianity claims that God is omniscient and also claim that humans have free will. The claims form a paradox, a falsehood.

Reasoning:
If God is omniscient then even before we are born God will have complete knowledge of every decision we are going to make.
Any apparent choice we make regarding the acceptance or denial of Hazrat Mohammed/Jesus as a savior is predetermined. This must be true to satisfy the assertion (statement) that God is omniscient. Effectively we have no choice in the matter. What we think is free will is an illusion. Our choices have been coerced since we exist and act according to the will of God.
Alternatively if human free will is valid, meaning that the outcome of our decisions is not pre-determined or coerced, then God cannot be omniscient, since he would not know in advance our decisions.

"free will" would be theoretically possible if:
1. God didn't know what his creations would do (not omniscient).
or
2. God didn't have the ability to control every aspect of what He was creating (not omnipotent).
or
3. God didn't create the entire universe (not creator)

Question:
If God knows the decision of every individual, before they are born, regarding the acceptance or denial of Hazrat Mohammed/Jesus as a savior, then why does he create one set of individuals destined for heaven and another set destined for eternal damnation? This seems unjust, perverse and particularly evil.

Conclusions:
If God is omniscient then humans do not have free will (see argument above) and the apparent arbitrary choice of God to condemn many individuals to eternal damnation is evil, i.e. God does not possess the property of omni benevolence and is therefore not worth our attention.
However, I do not see how compatibilism fits with a theism in which the creator God judges men based on their actions. This would be like a programmer punishing a computer because it gave the wrong answer. If God is an omnipotent creator, he would logically have simply made humans do what he wanted them to do in the first place (instead of making them so they do what he doesn't want and then punishing them for so doing). Thus, compatibilism makes God an incompetent.
If humans have true free will then God cannot be omniscient (see argument above). If he is not omniscient then he also cannot be omnipotent since knowledge of the future is a prerequisite for total action. Without these abilities God can no longer be deemed a god – i.e. God does not exist.
If humans do not have free will then the choice of whether to choose Hazrat Mohammed/Jesus as a savior or not makes total nonsense of Christianity since the choice is pre-determined and we are merely puppets at the hands of an evil monster.
The proof works no matter how many super superlatives are added. Whether the god is semi-natural, supernatural, outside of space and time, or whatever, it still comes down to – if he knows what we are going to do then human actions are pre-determined – i.e. free will is an illusion, and he remains a mere puppeteer.
By the way, I always felt that hell might not be such a bad place after all: it would be populated with people of at least a somewhat higher average IQ than heaven. It wouldn't get dull, that's for sure.
It looks like all the rational thinkers will go to hell – should provoke some really good debates without interruptions from the idiots who will have gone upstairs.

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