Of course it’s popular in Mexico, it’s syncretic paganism hidden under a thin veneer of Christianity.
It’s the same beliefs that Catholic Church in Mexico has tried to stamp out that lead the ancient Mexica to ritually slaughter people regularly to appease their Gods.
No wonder the Drug Cartels adopted it.
Yeppers..
>>”the Catholic Church in Mexico denounces Santa Muerte as satanic”
Not a good sign...