The idea of an afterlife is based entirely on theological beliefs since the stone age, similar to the earth being flat and the centre of the universe. Biology today understands the human brain very well, and how all of our thought processes work and are formed. To suggest that human thought processes can still exist after full brain death is 100% absurd, and is really not something that scientific inquiry would need to waste time dealing with. The idea is simply an impossibility to any organic life form that will one day die and cease to exist. Brain functions absolutely cannot carry on happening after the brain is fully dead, and rots away or is cremated because the organ responsible for creating our thoughts and consciousness has fully deceased. Again this is nowhere near the same thing as NDEs during which the brain is still physically alive and thus the means to create thought processes still exists.
It's exactly his attitude (especially the emboldened part) which is anti-science and very much not in line with the scientific method. The only problem I have with your posts is that, much like a religious zealot and much like those you profess to stand against, you stand by your ideologies and profess that they are backed by science when this is blatantly not the case. You are no different to the people you think so backward in their thinking, and that is the irony of it. Thankfully your opinions do not speak for the rest of the scientific community else we'd still be living in the stone age!
Time and again you ignore relevant parts of peoples' posts to continue to bang the same old drum. Science (or more accurately, certain groups of scientists) was not long ago stating it was absurd and 100% impossible to have such a thing as television, or a telephone. The inventors were initially ridiculed! Why waste time looking into things which are so clearly impossible?... Oh. Wait...
This attitude is very contrary to the true Spirit of science. That said, given science has clearly made great strides since last I looked, I'd love you to point me in the direction of this perfect understanding of brain function, cognition and consciousness. How does biology now understand that consciousness is formed? How does it arise? What is it? What is sentience? Where does it come from? What are emotions and why do they occur?
Science does not, and presently cannot, explain these things. Your assertion that it can and does is laughable and undermines your entire position. Stating that biology and neuroscience completely understands the mind and brain is a laughable assertion. You may as well tell those branches to retire given that they've exhausted enquiry.
You still maintain that since physical brain death is observable then it precludes the existence of anything else. Your self-imposed limitations in your thinking are precisely what clouds you from investigating, learning or experiencing anything new. You're no different to the Catholic orthodoxy blindly insisting that the universe was geocentric regardless of anything else. This is a shame.
While I have no issues with you holding the opinion (and that's all it is) that the physical brain and consciousness are irrevocably and inextricably linked, I do expect you to be able to show how and why, and to address the questions that raises, if you're going to profess that it's the be all and end all of the discussion... especially when you close by saying that science understands 100% of it by now. I'm pretty certain you'd be laughed out of a lecture hall for saying that in any decent neuro module. Or physics module. Or anything else.
Instead of simply repeating the same old closed statements, why not actually say why you think this is the case? Why not consider alternative theories and ideas? It's what true science is meant to be about. Not picking a position and sticking to it - we'd never have advanced by doing that.