I like to relay the following analogy to explain the issue:
Imagine that you are waking up in a bizarre culture where people take fairy creatures and comic books seriously. They debate about details of the comic books and vote on politics of the comic books and fairy tale fantasy as though these were a part of a reality.
You begin to notice the strangeness of such set up. You begin asking as to why they think any of it is real, and they begin attributing various things like lack of crime to the acts of Batman, and the miraculous stories of near-death situations that people experienced to the Flash and Superman. The blame the wrong things on their lives on Evil x-men, and they attribute the miraculous recoveries from sickness to the magical healing power of the Doctor Strange.
When you ask them as to why would they think that the stories in the comic books are real and not made up, they say things like... well there are real places and people described that we know existed in history, like presidents and celebrities, and cities. And that all of the comic books are based on collective eye-witness recollection with some help from professor X who joins minds together to form the best possible account of these events imaginable. Thus, they collectively think that you are insane for rejecting the "obvious" reality of their cultural mindset.
What would you point to in such case to convince these people that they are wrong about their belief system?
Essentially, that's what religion tends to do. It perpetuates a cultural mindset in which certain imaginary concepts that have no evidence in this world are treated as real, and thus the subjective interpretation of events that believers experience become "the modern day evidence" of the "acts of God". Someone got an unexpected check refund from IRS when they prayed for some financial help... miracle! Spontaneous recovery from cancer that falls in line with statistics of such cases... miracle! Someone beat a drug addiction... miracle!
Essentially, the religions, the way these are set up today are not very far from the bizarre scenario that I've described above. It's understandable as to why people would seriously consider certain propositions that otherwise should and would be utter nonsense fantasy... because politicians used religion as a tool to rule the masses, and thus spread and normalize the practice of religion in societies to the point where questioning religion became "odd" and "bizarre".
But, even in context of the thread... why would one think that any concept of "afterlife" should be of concern to anyone if the concept isn't falsifiable? People don't concern with them with idea like "before life"... which would be rather bizarre to a Christian. But, if "after life" is a possibility, wouldn't "before life" would be an equal possibility? Why not concern oneself with all of the possibilities then, no matter how bizarre these are?
We don't do that, because if there is no evidence for something being real... we don't treat it any different than non-existing. It really doesn't matter in scope of our reality.
