Well, in answer to the question of whether or not I believe in witchcraft... Yes, I do. Whole heartedly! Through out the last five years, in which time I have been a Very Enthusiastic Practitioner of the sacred Craft of Wicca, I have seen and done Many things. I have participated in Rituals, and Coven Ceremonies, and solo Practices alike. Through that time of practice so far, I have noticed that, as long as you have the Will Power, and the Devotion, and the Proper methods of Focus, you can succeed in what ever you may try to do. As applies in Regular Life in General as well.
Some people, who try hard enough, and practice for so long, as I have, and as I have noticed, do wind up greatly increasing not only their Spiritual Power, but their Magickal Ability as well. It is possible to become a Wiccan, or witch. Not as easy for the Latter, but Wicca is not just Illusion, and Conjuring. No,... It is a lot more than that. But, in order to become a True Wiccan, you must first be true to your self, and your Desires. You must come to terms with your Physical, and your Spiritual Self as well. Which, for some people, is not all that hard. But for others, it is a Very complicated, and strenuous Process.., As it was for me. I went from being a normal, arrogant 12 year old brat, to a newly transformed, and spiritually connected Wiccan.Thanks to the teachings of my mom, and other people around me.
I guess what I am trying to say, is that I do as I said, believe in Witchcraft, more so in Wicca, but I do still believe. I'm not trying to push my beliefs off on anyone and make them believe what I believe. I'm just providing testimony to what I've seen and done. In the hopes that others like me, or the Magickally curious, will go further, and discover what I my self, along with hundreds of other people, have discovered about the Sacred Craft. For then, and Only then, can one Truly fulfill their hearts' Greatest Desires.
But how can you be sure, that just because you believe in Witchcraft, or Wicca, that it does in fact Truly Exist..? Well, it's quite simple. Have you ever felt the hairs on the back of your neck stand on end for no apparent reason what so ever..? older People who have lived a bit longer than you have, will usually tell you that it happens because a person has just walked on your grave. Well, that is not all that far off from the real reason, actually. That happens, because a Spirit, of Malevolent nature, has just passed over the spot to which the Higher Power(s) have set for you to be laid to rest at. But how can you know the spirit has passed over the spot without some kind of magic occurring right at that very moment..? Think about that.
I see a striking similarity between your claims and that of many Christians: "Some person told me [x] and said it was in [book] and then i started to believe [x] and [x-related stuff] was really happening! I could totally feel it! It wasn't suggestive at all!"
Go do something productive. You're wasting your time believing in spirits and good and evil. If there's anything you've learned from "witchcraft" at least keep this with you: nature, the earth, is not inherently good or bad. It does what it does and there's no magic to it. Humans and monkeys and spiders and e. coli are all pretty much the same: lifeforms that are here for whatever reason, ever-multiplying until a catastrophic disaster or all the resources have been eaten up.