It is actually easy for me -as I have experienced things that "can't happen".
Ah! But you assume too much!
When I was young, I saw "something" and so did my brother ... and though we saw differences, we also saw similarities ... religious as I was in my later years, I proclaimed it a demon; but I no longer believe in such things ... all the elements of a "shared hallucination" are absent, and "power of suggestion" does not adequately explain the phenomenon as we never discussed this until I was in my adulthood.
In my adulthood, during a period of inner turmoil, scribbling furiously on a piece of paper with a lead pencil, I sat the pencil down and it rolled ... yet the surface was flat, there was no breeze, there was no slant in the table ... yet it rolled, predictably and repeatably ... other pencils, which seemed indistinguishable from this one, did not ... yet this one did ...
The last poignant example is feeling an overwhelming sensation that my birth mother was nearby ... I was 14 and had been separated from her for 7 years ... she felt the same sensation and expressed it to her husband while they were miles away from us ... Later, after we were reunited, we started talking consistently, and at times, I would pick up the phone before it rang and just say, "Hi, Momma" ....
Evidence is lacking to explain this phenomenon. No scientific explanation satisfies me in addressing them (and I tend to be very analytical). I no longer choose to juxtapose unprovable assertions, such as poltergeists, demons, ghosts, spirit, supernatural, etc. into these phenomenon; as there is no evidence that such things exist. So until there is evidence or explanation supported by evidence to explain these phenomenon, the answer to HOW, WTF is ... "I don't know".
But these kinds of "can't happen" experiences are not on the same level as the ceasing of planetary motions (which would cause otherwise stable and predictable mathematical algorithms to be "wrong") or a World Wide Flood (which would leave massive evidence, of which there is none) or a great Exodus (of which there lacks not only physical evidence, but the mysterious lack of the mention of such a massive slave revolt in Egyptian history and hieroglyphs).
Being open to possibilities while there is lack of evidence to the contrary is one thing. Being open to possiblities when there is abundant evidence to the contrary is another altogether.
So, can science disprove that I was visited by a demon, that pencils roll by themselves or that humans have perceptions beyond what science can clinically reproduce or explain, or show us what was before the Big Bang?
Okay ... No, at least not yet; and maybe never so. So from that perspective, possibly science can never disprove Or prove) these religious beliefs, be they true OR false ... But again (and I'm repeating myself, so this shall be my last post in this thread), it can certainly disprove religious beliefs when they trample on what science knows to be true; and what science knows to be UNtrue.