Scientific laws are factual descriptions of nature. They are not to be believed or disbelieved, but rather understood and accepted. You might as well ask if I believe in gravity. (By the way, the phenomenon of gravity, ubiquitous as it is, is not completely understood by science; there is no theory of gravity. Nevertheless, I am compelled by my senses to accept the varying attraction of bodies depending on their masses.)

Most living things on Earth get their energy, directly or indirectly, from the sun. A small minority get their energy from the Earth's internal heat (generated from the breakdown of radioactive elements). All living things use their energy to drive chemical reactions that allow them to build and maintain a body, procreate, gather needed, nutrients, etc. You can think of this process as creating order out of disorder. The chemical reactions of life are mostly facilitated by proteins called enzymes, which are built according to the organism's DNA code. most of the energy that an animal like a human
being takes in is used for moving around, digesting food, running the immune system, thinking, etc. As these activities are carried out, the energy is released in the form of heat. The heat dissipates into outer space. Some of the energy is also used for growing, by building macromolecules like proteins, fats, oils, DNA, and glycogen. These molecules contain energy in their chemical bonds.

When an organism dies, the reactions specified by the DNA cease and a different set of reactions take over, resulting in the decomposition of the body. This second set of reactions is also driven by solar energy (heat). You can slow these reactions down by lowering the ambient temperature. That's why morgues are kept relatively cool. Since this second set of reactions is not guided by DNA but rather another thermodynamic law called entropy, the body goes from a more ordered state to a less ordered state. The spontaneous breakdown of the body's tissues is usually accompanied by the release of heat. This heat also dissipates into outer space.

Ultimately, the amount of energy taken in by an organism is exactly equal to the amount that it gives off during its life and subsequent decomposition. The ledger is perfectly balanced.

Energy comes in many forms - heat, electric, potential, kinetic etc. "Human" is not one of them.

Unfortunately, “energy,” used in a non-specific and unscientific way, has become a popular buzzword with the new-agey “spiritual”/superstitious crowd. “Quantum” is another word purloined from physics and misused to justify all sorts of crackpot ideas.

(Be careful: I was convicted of breaking the Fourth Law of Thermodynamics back in the ‘60s and served 10 days in the county jail in Greenbow, Mississippi. It’s the law.)

We "Accept" scientific laws. They are not opinions to "Agree" with...

I agree that 'energy can be transformed from one form to another, but can be neither created nor destroyed.' I think it is good to ask what happens to our energy when we die and when we are conceived. I was raised Agnostic/Atheist, yet often have pondered why I identify deeply with earlier time. I think individual consciousness is part of all energy.

I think it’s a mistake to separate “human energy” from all energy.

When a person dies, the energy contained in that entity is simply dissipated into the environment that contained it. via release of heat, chemical reactions, and physical changes. It is as simple as that.

I don't put beliefs around scientific facts. It's redundant.

"The thing about science is that it doesn't care if you believe it or not"

Can you tell me what is actually left after one dies? Can you measure what you are talking about? Sources?

I have no beliefs. My world view is founded on falsifiable evidence. The First Law of Thermodynamics is an observable phenomenon (and is hence falsifiable), no belief required.

I agree with the theory of Thermodynamics. When we die we no longer consume food which means we no longer burn calories (energy). Our brain stops functioning from lack of energy and we no longer exist. We are just a mass of bone and flesh that returns to the earth.

If energy can't be created, then why does the sun give off so much energy?

When a person dies does the released energy make things shake and quake? Not that I have seen except maybe in the movies. You are not likely to be present when someone is shot to death and experience this energy either. Here one minute and gone the next. It works that way in hospital waiting for the loved one to die. The only manifestations along this line that I have witnessed appears to come out of the anger we find in survivors and not anything from the dead and dying.