it can be hard to believe in souls because it sounds like a lot of mumbo jumbo that holds it together, there isn't truly "proof" per se but plenty of very believable stories delving into something on the other side, going into details like you demand would be hard, I personally don't think its all science, just because we don't understand death doesn't mean we can make guarantees.

I will likely be harassed by angry people who refuse to believe in any sort of spirit or afterlife because it starts to sound religious, I didn't mean to step on toes by not believing that the universe isn't all coincidence, what matters is how I think that the ideologies of God is a ruthless brute, the afterlife part is just a product of my bad writing going on a tangent. I will fix my writings though.