In my opinion people who argue against, any belief without providing evidence for there argument makes them just as "foolish" as people arguing in favor of. simply saying there is no evidence is not proof of your argument
If you're referring to me, I actually did provide evidence that our body is all we have. You seem to think that evidence equates to proof, but it isn't. It's really hard (if not impossible) to prove anything.
That idea runs into problems when advanced cybernetics becomes a reality. Because the barriers of what constitutes living and non-living entities becomes blurred when brains can be augmented with processors. Eventually the brain issue will die and a person will be forced to fully integrate their being into a pure machine form which at point emulates the mind as if it's organic. The problem then is, are they still alive because the information is still consistent to their being? Or are they truly dead and the machine is a mere echo of their existence?
Just thought of an idea to test this:
Say you augment a connection into a subject's brain and deliberately induce brain death while linked to a camera with some level of AI capability and memory storage. Then you show this camera a series of cards and engage it in casual banter by making hand gestures. After a couple of minutes you revive the brain and ask the subject to recall the cards while connected. The moment the reviving occurs, the camera's AI is switched off so only the results of the cards test are stored.
Bear in mind it's not if information was attained that's being tested here, it's how it was experienced. If the subject recalls the cards by their content only then they are only accessing data from the camera upon recovery. If they recall it as if they were living like the camera's "mind" and recall the banter too, then they were dead but gained momentary consciousness of a non-living system, thereby demonstrating a potential life after death (just not as you at all).
It's flawed I know, but it was an interesting thing to think about though.