there are many NDE cases where a child below age 10 will have an NDE, which is exactly the same as an adult case. They will see a tunnel, a light, Jesus, Mary, some report sitting on Jesus's lap, etc. How could.a 4 year old who doesn't know he or she is about to die (let's say they drown or get hit by a.car from behind) have an OBE and see all this religious imagery? My guess would have been that they might have seen a tunnel and light as that could be a biological factor of what the brain does under stress, and maybe their parents kind of swayed them into the whole Jesus direction? These kids have interviews and can be found all over the internet. However, we are told that the kids tell the nurse right after the experience so that the kids.could not have told their parents. I know some may lie, but assuming some don't intentionally lie, what would you say about that? Dr. Morse did tests on kids who were on meds and drugs and not near death, found they didn't have the same experiences.
Manga, there's so much I would love to talk about with you. First, most 4 year olds who have NDEs don't in fact "know they are about to die". Because they are 4. But that doesn't matter at all, because there are good explanations as to the physiology of NDEs. And yes, it has to do with what a person's brain and body are doing at the time.
Second, from what I've read of your posts, I get the feeling that you don't understand (indeed nobody has a full understanding) how powerful our brains are, and how much credit we should give our mind/body connection. I'm not talking anything spiritual here, I'm just talking the science of how our brains work. (Most of us....) I think humanity is still at the beginning of understanding our inner workings of brain activity, and it's a fun, fascinating subject! But give a person's brain credit for these experiences, not their "soul". Because.......
Third, look around for stories of NDEs from other countries, cultures and belief systems. It may be eye opening for you. There are similarities, but you will see that others' experiences vary, according to their culture and their Gods. Does this mean that all religions are true? Nope. It means that people, young and old, are influenced, even in death, by what they believe.
And finally, may I posit that you, reading stuff on the crazy Internet, will not be able to prove a soul exists. It's an interesting topic, but really, it shouldn't be a deal breaker for you either way. Believe in souls if you want! There's truly no way at this point to prove or disprove the existence of souls. And I feel like this question is driving you crazy.
I encourage you to look to things that are relevant to living and discerning whether God is real. Look at logic, look at archaeology, listen to smart people, like Matt Dillahunty or Richard Dawkins or Christopher Hitchens. Read stuff like Why Wont God Heal Amputees (a weird name, but excellent ideas, questions and philosophy on the question of Gods). There is a world of information out there for you to find that actually matters to this God question.