A controversial (yet true) Calvinist belief is that COLLECTIVE societal poverty is (generally) the result of sin

This isn't prosperity gospel, which says that God supernaturally punishes you with "bad luck" for not having enough faith. This is just common sense: a society that follows the 10 commandments will prosper and one that breaks them will suffer.

Liberals think poverty just "happens" to people and the solution is to redistribute resources.

However, Calvinist societies (Puritans, Afrikaners) have disproven this over and over again. East Asia was utterly destroyed in the 20th-century and they built the most advanced countries on earth. On the contrary, a population that regularly engages in violent crime and fornication will turn any successful wealthy city into a ghetto.