Welcome!
I want to quote something that a thought was aweeesome by a notorious member named sethyboy. It's a great post, hope you have the time to read it.
Remember what it was like before you were born?
Probably the same shit after you die.
I'm going to actually post something a little more serious now.
Your emotions, your automatic (breathing, heartbeat, finger wrinkling) and controlled (farting, calling people dickheads, masturbating etc.) motor functions, and your entire ability to sense the world around you are all a part of your brain.
When you die, your brain stops functioning entirely. Even if it wanted to, it isn't getting any oxygen to do so. When the single-celled organisms making up your body die, that's pretty much it. Game over.
Another thing to note is that everything you know and all of your memories physically exist inside of your brain. That's why associating new things with things you already know helps you remember them faster - you build connections between different parts of your brain.
When you die and your body is buried, it eventually decays and goes back into the earth it came from. No matter what you choose to have happen to you after you die, the atoms that made up your body still exist and are on the earth (except for space launch burial).
Even if your body is perfectly preserved, it will eventually be swallowed up with the rest of the earth into our Sun. If your body leaves the solar system, it will eventually be caught in some black hole, supernova, or some other form of cosmic phenomena that will destroy it. Once inside some cosmic entity, the atoms that made you become part of it, and could even be changed entirely through nuclear fusion or conversion to energy. What all this means is that any kind of afterlife that relies on your body staying intact cannot last forever, as your body will not.
As for the concept of a soul:
Everything you experience comes into your brain through sensory organs. With the brain shut down, you cannot experience life any longer. All of your memories and the wiring in your brain that made you act the way you do are now just dead brain cells in a dead body.
Seeing as the afterlife is in what seems like an entirely new reality, and your brain cannot generate this reality due to it being dead, your soul must also exist out of our current models of reality and space time. Nothing from your body can go anywhere because for something in you to disappear would either violate the law of conservation of energy or the law of conservation of matter. Because the supposed soul exists outside of reality, and it is impossible (as far as we know) to observe it, anything said about souls and where they go is pure speculation, relying on the assumption that the soul even exists. Your consciousness is merely just your brain thinking thoughts and reacting to sensory input, which doesn't happen when you are dead.
Same as allat, there are many things I am unsure about, however, if god supposedly existed, who knows what/who he is? The moment something can be debunked (like Islam constantly is) shouldn't we just move on instead of clinging?
We don't need to be obsessed finding who the real god is. The Quranic god is angry, threatening, mean, and so so needy. Then he offers a few chapters to tell us what we will get in return for spending a lifetime worshipping him.
Religion aside, Islam is just another system that offers some philosophy on life and you can take and leave whatever you think is useful - don't need a religion to tell you stealing/lying/murder will hurt others =]
Regarding the perfect human - I mean...the question sounds wrong. You're basing that on Mohammed supposedly being the perfect example right? It's just a romantic idea; perfection doesn't exist, and it's definitely subjective. To me, no matter how good he may have been, to endorse wife smacking, be it with a feather, a metaphor,
whatever, it detracts from his "perfection" immediately.
I'm interested in your answers to your questions btw
Hope to hear from you soon!