Reincarnation is mathematically impossible - at least as it is described by the major religions that believe it.
Buddhism, for example, at least some forms of Buddhism believe in 31 planes or levels of existence through which all souls are sojourning or traveling through. At the top is is true enlightenment the highest state which once reached is called Nirvana. The doctrine is that everything was once literally “Nothing” and that “Everything” is a function of the great nothing becoming unbalanced. (Yeah that sounds weird to me as well) The deal is all temporal souls were created when nothing became something and we’ve been trying to work our way back to nothing every sense.
The way we do that is through a series of lives as various creatures where we accumulate either good or bad Karma. The only thing that survives the previous life is the Karma. There are no memories of past lives to regress to - only Karma.
Here is the problem. All souls appeared out of the perturbation of the cosmic nothingness at the same time. Thus there are no new souls being created. Since a few souls manage to reach the original state of cosmic nothingness that means that the total number of souls (People and animals that are alive) should remain almost constant but should be falling at a slow endomatic rate as souls in ones and twos pass from being Bodhisattva’s and are absorbed back into nothingness.
Yet that is not what we see. 95% of all animals and people that have ever lived are alive today. For example: In 100 AD there were about 200 million humans on Earth. today there are over 7 Billion. There are also, thanks to advances in animal husbandry and agriculture more cows, horse, chickens and pigs than ever before.
Thus how is it possible that we have all been reincarnated several times when there are simply not enough ancestors?
There are only a limited number of ways to explain this.
1. Some of us have no souls or are some type of persistent illusion that is viewed by those with souls - in which case not everyone you see has been reincarnated because some of us are not really here.
2. Some of us are a soul that has procession of more than one body simultaneously. In that case how does the “Past live regression coach know that what is experienced is a past life and not a concurrent life?
3. New souls are being created all the time to fill the new bodies. This also means that there will be a large number of souls that have not been reincarnated.
4. There is no such thing as reincarnation.
I think #4 is the only plausible answer
Yet that is not what we see. 95% of all animals and people that have ever lived are alive today. For example: In 100 AD there were about 200 million humans on Earth. today there are over 7 Billion.
The universe is vast and mind is not limited to this planet.
I am not a believer in reincarnation or materialism...but the materialists have proposed multiple universes to defend their beliefs from the big bang and/or other scientific models that strongly suggest the universe is not eternal but had a distinct starting time. So if the materialists can grasp at such an outrageous straw...perhaps we can allow the reincarnation list to include:
5) We are just one of a vast number (maybe infinite) universes some of which could have evolved life, and souls can be reincarnated in different universes--some of which have a declining number of appropriate animals to balance others like ours which have an increasing number.
Would that mean in this hypothesis that they're here physically but not spiritually or that they're an illusion of those who are here? So all of those who have souls view the same illusions? Can those who "are here" identify those who are not? The second possibility would frighten me because it would justify two-tiered humanity.
There's not knowing and not understanding. Could it be that who posseses a soul is unknowable? I accept that there are things that are unknown and unknowable to humans.
Now mix this with messing with DNA, organ transplants, the possiblility of splicing DNA for non-human characteristics in humans. Do these things create soullessness?
These are all crazy questions, for sure. But I wonder. We can't be all there is. If we were, we'd self destruct by now. Maybe if there are more humans than souls, humanity is destined to self destruct, as our being depends on a higher order.
My head is spinning.....