To be clear, I wasn't referring to Hell or anything like that, especially since the notion is rather fuzzy in Christianity and is completely absent in e.g. Judaism, so it's not a universal monotheistic thing, but rather to day-to-day pain and suffering As to your point that suffering or non-suffering is made irrelevant by permanence, I think not everyone would agree, but more importantly, humans in general aren't particularly good at dealing with infinities, even imaginary ones. So the selling point there isn't so much so the abstract philosophical notion of eternal bliss, but rather the very concrete one of not having to ever again deal with some painful events that you regularly face IRL, like starvation or your small children dying.

Regarding your take, it reminds me of how in David Brin's Uplift series, humans are mostly non-religious but often invoke a deity called "Ifny", short for "Infinity", which is basically a personification of luck as you describe it. It's not an uncommon thing, either - indeed, I would argue that most pre-monotheistic religions are largely that, just with specialized gods responsible for different manifestations of luck, so to speak (so e.g. you'd pray / sacrifice to the god of harvest to ensure that no unlucky events would happen this year that'd ruin it).

Monotheism is rather different, though, and I think it can be distilled down to the archetype of a perfect government - which would also explain why it only arose sometime after the first large centralized states, and was largely spread by them. But this also takes care of the "unlucky" angle in a sense that there's simply no such thing as luck in a perfectly ordered universe.