You can only get 100% proof in mathematics. In science you can only say what is the best hypothesis to explain the data. Every scientific controversy shows that the best hypothesis is only a matter of opinion. However when they look deeply into the phenomenon, ie not just at superficial attempts to debunk, not just the weakest cases but the strongest, and consider how the investigators respond to critics, many people including Nobel prize winners and other scientists consider the evidence for the afterlife to be overwhelming.
If you haven't read several books on the subject by those who find the evidence convincing and then gone deeper and looked at the original research reports by investigators, then you are not well informed on the subject. If you are basing your opinion solely on what self proclaimed "skeptics" say you are not well informed on the subject. If you only look at what is published on the internet, you are not well informed on the subject.
If your preconceived ideas are so fixed that you feel it would be a waste of time to become well informed, then your opinion on whether consciousness is produced by the brain is based on faith not evidence and is religious not scientific.
There is extraordinary evidence for the afterlife.
http://sites.google.com/site/chs4o8pt/summary_of_evidence (Includes links to free e-books on the evidence for the afterlife.)
http://ncu9nc.blogspot.com/2014/04/near-death-experiences-and-afterlife.html#facts_evidence
This evidence includes:
Mediumship: Proxy sittings, Drop-in communicators, Cross-correspondences.
Near-death experiences, veridical near-death experiences, and shared near-death experiences.
Death-bed visions, veridical death-bed visions, and shared death-bed visions.
Apparitions and multiple witness apparitions.
Children who remember past lives including those with an unusual type of birth mark on their body where an injury was sustained in the previous life.
Neither ESP or Super-psi can explain the evidence for the afterlife:
Poltergeist phenomena not associated with a particular person, drop-in communicators, cross-correspondences, etc.
http://ncu9nc.blogspot.com/2009/06/survival-and-super-psi.html
Mrs. Piper's Mediumship:
http://ncu9nc.blogspot.com/2009/05/further-record-of-observations-of.html
Nobel Prize winners Max Planck, Erwin Schrödinger, Brian Josephson, Sir John Eccles, Eugene Wigner, George Wald and other great scientists and philosophers such as John von Neumann, Kurt Gödel, Wernher von Braun, Karl Popper, and Carl Jung believed consciousness is non-physical because of the evidence:
http://sites.google.com/site/chs4o8pt/eminent_researchers
Consciousness is not produced by the brain. Consciousness is not an illusion or an epiphenomenon or an emergent property of the brain. Objective measurable physical phenomena cannot produce unmeasurable subjective experience. Correlation does not prove causation, the brain does not produce consciousness it filters consciousness. Natural selection would not produce consciousness. The brain is not a conscious computer.
http://ncu9nc.blogspot.com/2012/08/the-materialist-explanation-of.html
Why you should not automatically trust "skeptics" but should demand the same high level of proof from "skeptics" that they demand for claims of the paranormal: Skeptical Misdirection:
http://sites.google.com/site/chs4o8pt/skeptical_misdirection
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http://ncu9nc.blogspot.com/p/62014-...-afterlife.html#articles_by_subject_afterlife)