You're an idiot. No self-respecting wytch is going to incur the karmic shitstorm that a curse whips up just to satisfy your ignorant curiosity. How about a counter challenge. You insist God is real. Well, I have been near-sighted all my life. Go ahead, call down your God, and have him heal my sight. Do that, and I'll believe.
See how stupid that sounds?
Make no mistake that, wytches absolutely believe that curses, and hexes work. After all, a famous wytch is often quoted as saying "A wytch that cannot hex, cannot heal; A wytch that cannot curse, cannot cure," However, one of the basic tenets of Witchcraft is "Be ever mindful of the three fold law ye should/Three times bad, and three times good,"
In other words, if you are going to even consider casting a curse, or a hex, you consider, carefully, your actions, and you make damned certain that your reasons for desiring to do so are well worth whatever karmic backlash you are going to bring on yourself with the effort. And, sorry, RWNJ, your petty curiosity just isn't.