"Energy"? I don't understand. If such "energy" exists, it must be measurable, like energy always is. Energy is a very concrete phenomenon. Everything in the universe is made out of matter and energy, including me, so all the energy inside me is part of my mind or body (the mind is actually a subset of the body). If it is not measurable then there's no reason to call it energy. And if it isn't measurable, how can we say it exists at all? How can something we can't measure or detect in any way have any influence on the physical universe which contains my body and mind? I just don't get the idea that there are things in this universe which we can know of and are not made out of matter and energy (in the scientific, physical sense of the word). People seem to think these "souls" exist in some sort of undetectable parallel universe, a kind of transcendental la-la land which there just isn't any evidence for.

As Thomas Jefferson put it:
To talk of immaterial existences is to talk of nothings. To say that the human soul, angels, god, are immaterial, is to say they are nothings, or that there is no god, no angels, no soul. I cannot reason otherwise ... without plunging into the fathomless abyss of dreams and phantasms. I am satisfied, and sufficiently occupied with the things which are, without tormenting or troubling myself about those which may indeed be, but of which I have no evidence.