Yes, I'm a Heathen, I do on occasion practice some magic, mainly using bind-runes. I do not practice it on other people though (unless they asked me to), only on myself.
And I do have a friend who practices the religion Santeria. It's not my thing though.
I'm Wiccan. So yes. But I think Santeria and voodoo are really twisted forms of magic that are often used to hurt people. Wiccans live by Harm None, Voudun do not.
* my religion is Wicca and I do practice a little magi ck, but my main emphasis is on the religion part. I think it would be cool to see a Saneria ritual in person though.*
I believe it's entirely possible that witchcraft works. I've certainly seen some impressive results after performing spells. I go into each work of magic with the firm intent that it will be effective.