Well when it comes to reincarnation specifically, I have a problem with that too (surprise!).
I haven't read much of Ian Stevenson specifically, but I assume reincarnation is that the soul of a person has lived as the soul of someone else before. And after I die, my soul can be reborn or reincarnated in someone else.
I would recommend as you seem interested in these topics that you acquaint yourself with Ian Stevenson’s work. One problem with your theorizing below is that it doesn’t match the real world evidence of work like Stevenson’s (as the tip of an iceberg). So I have to conclude there are some flaws in your theorizing below.
First of all, the population on Earth is growing exponentially, which means that everyone cannot have lived many lives before and new "souls" must be created into some humans (which begs the question of why not everyone then). Or have some been animals in previous lives? Still, the total population of animals also varies - did a lot of souls really die after the meteorite hit us 65 million years ago and did some of them wait for milions of years until populations rose enough that a free "slot" in some animal allowed them to be reborn?
So if population is growing, new souls must be "created", and if population is declining, souls must either "die" or be destroyed, or they must be able to wait for a long time until a free body is created where they can live again. This means that souls can be created and destroy (or at least not return to a body immediately), so why would not all who are born have new souls and why would not all souls die or go into waiting mode indefinitely when someone dies?
The issue with the above thinking is that it assumes a closed and fixed number of souls in the human reincarnation system. But think about it; at one point in time there was probably just a handful of early humans; and before that, no humans. There are essentially an infinite number of souls in the universe. Only a tiny, tiny sliver can ever incarnate as a human. An increasing human population allows more souls to have the human physical experience; and shorter periods between them if desired.
But there is more! Because I have given a lot of thought to this and arrived at the conclusion that we humans do not have a soul.
By soul I then mean an "essence" of us or our personality that exists even if our bodies die. If soul means "someone's personality" or "the software that runs on the computer that is our brain", then we do of course have souls. But the metaphysical soul does not exist in my opinion.
Because if there was a soul that didn't die when the matter dies, why is that soul so affected by chemicals such as drugs or alcohol, or by tumors in the brain or stroke or brain damage? Specific cases of dementia or tumors in the brain are known to change someone's personality completely. Where then is the soul that should direct our actions? If it is the soul that is the real "me", why does it get exactly as drunk as my physical brain?
I had a minor surgery earlier this year, and when I was in anesthesia, I was truly gone. And that even though my brain wasn't dead! Where was my soul then? It was like a complete time loss. Not even blackness. Not even nothing. Just like before I was born.
How can people have memory loss in certain situations? Will my soul remember anything at all from my life when I die? Because we know today that memory resides in the physical brain, and certain types of brain damage will destroy it. And I would imagine death is such a damage.
So if the soul doesn't really control me when I'm drunk or have a brain illness so my actions (and therefore everything people see as "me") are governed by the physical brain, and my soul won't remember me after I'm dead, then it is no more than a parasite that tags along for the ride. Then what use is it and what evidence is there for its existence? And is the soul "me" or is it someone who observes me while the real "me" is my brain which dies along with my body?
I believe that the day I die (or perhaps before if I get dementia or have a stroke or any other disease that causes me to lose myself or my personality), my meat computer stops working and everything that is me dies with it, except for anything I've left behind like music or art or stuff like that. But I will be gone for good. It's like a computer, when you switch it off, the soul of Windows 7 does not keep on living.
It might sound terrible and negative and pessimistic, but I feel that this makes life even more worth living, more wonderful and beautiful, and we must really make the best of the time we have, because when it's light out, we are truly and forever gone.
I do not fear death, as that nothingness is not something I will experience, as I'm gone then. I won't lie in the coffin thinking "oh, I can't think anymore - how strange!". But I do fear death in the sense that just before I go, I'll be very sorry that I won't be able to experience anything more. I'll then miss the world and I'd love to see how it carries on without me. But the moment that I'm dead, all those emotions will be gone. But the day I die, it's the end of the line and I imagine sadness will be the dominating emotion at that point.
And that day, when it is your last day, just going outside in the sunshine and smell a rose one last time would be worth more than all the gold and diamonds and money in the galaxy. So make sure you fully live life here and now and smell the roses and enjoy it all because it won't last forever. Nothing lasts forever.
Well let me explain my take on the soul from my exposure to Theosophical and eastern/Hindu teachings. This is a vast subject that I don’t know how to put in a post reply, but basically:
Consciousness is not physical. Consciousness expresses itself through the planes of nature by taking ‘bodies’ on each of those planes. For example the Causal Body (reincarnating Soul), Astral Body (temporary between life state) and Physical Body. Damage or death to the physical brain just stops or impinges on consciousness’ physical experience (which we mistakenly think is all there is). But the Astral Body and Causal Bodies are unaffected by the physical bodies demise but actually can express themselves better without the gross outer sheath of a physical body.
The guru teaches that you are not the causal body, the astral body, or the physical body but the consciousness that experiences them which is non-physical.