Religious zealots are always warning other people that their blasphemies against the One True Faith (of which there are many) will be punished by the wrath of gods, or spirits, or the heavenly hosts, or some other supernatural entity.
But then, in reality, those gods and spirits never show up to punish anybody for committing blasphemy.
It’s always humans who end up punishing other humans for committing blasphemy.
It sure looks as if blasphemy is a concept that was invented by people in order to control other people. There’s nothing supernatural about blasphemy at all. It’s just a crude tool used by human beings who want to hold power over other people.