Frisiangal, nice to see you joining this thread!
By my comments I mean no disrespect towards people in cultures where black magic is a firm belief. However, if you look further, you will find members of those cultures themselves who are critical of it and don't believe in it. So we have to be careful, as outsiders, about what we assume.
Also, in all kinds of magical traditions, there is the Forer (Barnum) effect. People believe what they can be induced to believe. This doesn't mean that the Barnum circus sideshow freaks weren't actors, or that stage magicians don't use smoke and mirrors to make audiences believe things that aren't real.
Let's unpack your N'Awlins experience. Possibly this woman believed in black magic herself. Possibly she thought she could give you the "evil eye." Possibly she thought you would think so, too; and warned you away.
Why? Did you ask her? Maybe she expected a modeling fee. Maybe she just didn't care to have her photo taken by one more tourist. Maybe she believed that to take a photo of a person is, in some way, to steal her soul. And so on. And somebody made money off you by selling some tourism souvenirs called "protection masks and beads."
And what kind of "wise woman" would try to give an innocent tourist the "evil eye" in the first place? This doesn't sound wise to me.
So I don't dispute for a moment that these beliefs in black magic exist. As in, c'mon. Any student of history or culture would know this. When I was a kid I believed that the wicked witch of Disney's
Snow White might come out of my closet at night and harm me. Disney made a lot of money off this film, incidentally.
The question relevant here is whether any of these beliefs are real, beyond the boundaries of belief systems, suggestable people, shadow material, and psychological projection. I say not.
If someone is an atheist, there are no djinns or disincarnate evil spirits or entities out there. If someone believes in God (however this concept appears in his faith) then simultaneously to believe in evil spirits or black magic profoundly disrespects this God. Somehow this God would seem less powerful, less magnificent, and committed to evil, to create and allow this sort of belief.
Judaism was not immune from all kinds of superstitions, ranging from idol-worship to Lilith, the Evil Eye, dybbuks, to golems.
http://www.jewishencyclopedia.com/articles/14119-superstition
http://en.wikipedia.org/wiki/Dybbuk
http://en.wikipedia.org/wiki/Golem
The Hassidic idea of God retracting Himself, vessels of divine sparks and so on is an interesting belief system that can be traced historically and culturally.
I don't think there was any "wisdom of the eons" in these beliefs, but from a cultural-historic perspective we can see how and why they developed amongst a perseceuted minority living amongst populations who themselves believed in black magic.
The longer I interact with my eclectic and biblically influenced spirituality, the less I understand God (divine consciousness) as something outside of humanity. Again, there is a lot of psychological projection in defining humans as miserable worms, and attributing anything powerful and magnificant to a celestial power. If God is everywhere, then humanity is part of what God is.
Namaste: "I respect the God in you." This doesn't mean that the ego recognizes this relationship. The ego creates enough trouble to explain most troubles in the world.
We can get into problems of evil actions, free will, and the rest of it if you like, but possibly on another thread.