I'm a Christian and I also dont believe voodoo is everywhere since every nation for diversity of culture but in Africa where I come from some people who are traditionalist does use voodoo in gambling and it does works for them. However, such voodoo is hard to find and also have limitation either.
It is contradictory to say that something you don't believe in works for someone.
Gamblers are making all kind of things up to make them believe they will win and when they do they say it is because of lucky charms, voodoo dolls or other items, the thing is eventually every gambler will win and forget about how much money they lost, that is what is important in this story, that's why lucky charms.