UmmHurayra

==> I think for now the best definition I can give, would be human consciousness. It has no physical existence, do you agree on that? So physical atoms and molecules could not create it as it is entirely in a separate domain. And yet , we all possess it.
So no the soul is not the mind. The mind is more like software and the soul is your power supply. You can think of it as your individuality, how can it not exist? <==

Mutorc . . .

Consciousness is the outcome of having a functioning brain. Consciousness does not exist without the physical existence of the brain. In addition, altering the brain alters consciousness, providing support for the idea that consciousness is made by the brain. To say ==> The mind is more like software and the soul is your power supply <== is simply an assertion, and a pretty poor analogy, after all, a power supply is a physical thing.

As far as where does the energy go when a person dies? There is no reason to think it different to the where energy goes when a tree dies, or even when an old plastic bag decays and falls apart, eventually being broken down into simple chemicals. Things are held together by chemical forces, and when dead, those forces are uncontrolled, and allow the thing, (human, tree or bag for example), to fall apart, and any energy freed, to become part of the environment, either as lost heat, or locked in the chemical remnants that are left behind and dispersed over a lesser or greater range.

In living things, this process of decay and falling apart, and giving off energy goes on all the time. Evolution has supplied living things with mechanisms of physical and chemical foundations, to repair the ongoing damage caused by merely being alive

Considering ==> your individuality, how can it not exist? <==

It exists as long as you are alive. It is the sum of your physical form, your genetics, (which is a physical/chemical process itself), and your experiences, (physical, physiological and psychological). All of those are rooted in the physical, some from simple chemistry and physics, and some from inheritance, and some from happenstance.

There is no evidence that consciousness exist separate from the physical form, including the brain. Let's not forget that animals are conscious beings too, to a greater or lesser extent, depending on those same physically based features I previously mention, ie. their form, their genetics, and their experiences, (physical, physiological and "psychological").

Furthermore, I know of no evidence of a soul, nor any necessity that such a thing exist in order for the universe and the world to be just the way that we observe it to be. If we question the very existence of a soul, then it does not exist in another domain, and I'd even question that such different domains exist. The domains are mental constructs invented by some people and propagated by their adherents, to try and justify something held as a belief, without evidence, (at least no evidence of which of which I am aware).

Cheers, Mu.