I don't think that they all work all of the time.

If you think about it though, all mysticism and religions seem to agree that a persons intent can influence reality. Whether you are praying to God, performing a ritual, casting a spell, or putting pins in a voodoo doll, you are intending to either alter reality directly, or ask an intermediary to do it for you.

You bet I believe in what Voodoo can do, if applied by the correctly trained practioner. I enjoy reading what it is all about and beliieve enough in it, and other types of magic as well, as to just read about it and not get creative with what I have read.

I think, that it depends on different factors. That's why I should say, that they work sometimes. Of course, it's rather strange idea, that everybody can read some voodoo spell and get an effect. On the other hand, sometimes they will definitely work: at least from psychological point of view.

I believe in magick and witchcraft, because of I tried those powers. But, Voodoo is a relious system, promulgated by President Aristide as the official religion of the Republic of Haiti several years ago.
It is not a witchcraft.
Good texts how to obtain a magical powers are in yoga and ancient Egyptian texts.
See for exmaple Shiva samhita.

But voodoo as a religion pre-dates the importation of slaves to Haiti in the 1700s, as well as into the US around thhat same time.