Because I believe in the scientific method, I am open to any possibility for which there is adequate evidence. Scientists are constantly discovering new things and revising their theories. Sometimes these revisions are very startling. But if the evidence is good, we accept them. In order to believe that there is something more happening in the brain, besides biochemical processes as I have described, we obviously would need evidence. And we do not have any.

People who believe in souls also believe in ghosts, because what is a ghost if not a disembodied soul? And lots of people have produced evidence of ghosts, photographs, weird noises, videos, there's a whole TV show about ghost hunters. All of this evidence is faked or misunderstood at best. People are in love with the idea because they want to believe in their own immortality. And being in love with the idea, they will go to any lengths to support it. But there is no scientific evidence that there is some mysterious spiritual energy, force, entity, ghost, soul, ectoplasm or whatever you want to call it. It does not hold up under actual scientific examination.

But what if it does? Fine, if it does, then scientists will have to reconsider a great many things. Scientists are always interested in learning more about the natural world. At the same time, scientists are not eager to waste their time with fake evidence concocted by charlatans. But sometimes they do take the time to do so, just to show that they are playing fair, and not just rejecting anything that does not fit with their existing theories. I don't know if you have read the book "The Demon Haunted World" by Carl Sagan, but I consider it to be must reading. If you really want to understand the difference between science and pseudo-science, this book is essential.

Getting back to the other points in your comment, I find that I make better decisions when I am conscious than when I am unconscious. I do not see why you have a problem with this concept. Consciousness gives us control of what we are doing, it allows us to think intelligently about our situation. If we do not make conscious decisions, we would then have to operate solely on instinct or reflex. There are plenty of organisms which do this quite successfully, such as the jellyfish which has no brain. But people are more intelligent than jellyfish (perhaps I should say, most people are) and we can do more things more successfully than jellyfish can, even though jellyfish are very successful in their particular ecological niche.

The human brain can malfunction. When the human brain is performing random physical actions, the result is an epileptic seizure, or in more severe cases, a coma or death. So yes, we can distinguish between a brain that is running its programs and one that is engaged in random physical actions.

I do not fear that God might exist. I would actually love to have some supernatural help in my life and I would love to be an immortal spirit, but wanting it does not make it so. I am simply being honest with myself. The logical problems with belief in God are absolutely stupendous. They are well described in the book "The God Delusion" by Richard Dawkins. Many people take offense with Richard Dawkins and find it terribly unkind of him to rain on everybody's parade, but his book is flawlessly logical.

And no, I cannot agree that "we don't know much more" than that there is some relation between the brain and consciousness. We have very detailed knowledge about which parts of the brain produce which mental processes, such as memory, emotion, each of the senses, control of motor functions, thoughts, etc. Even sexual desire has been specifically located (it's in the hypothalamic cortex). There is a vast amount of neuroscience that you are dismissing.