First of all, anyone using Wikipedia as a definitive source of facts is an idiot. Anyone can join Wiki and pull "facts" out of their you-know-what.
There's an on-going debate as to who started Wicca: Gerald Gardner or Aleister Crowley. No one really knows. The fact of the matter is, Wicca is a contrived religion - just like every other religion out there. So what if Wicca was started in the 1950's? Why does that make any more or less valid? Ancient religions had to start off somewhere, too.
Unfortunately Wicca, like any other religion or group, has become a huge clique and popularity contest. It's no better or worse than anything else. I had to find that out the hard way:
There's a popular Wiccan "learning order" where I live - that will remain nameless. They try to pass themselves off as a learning order, but they're really a coven. I tried to get involved with them because my husband was involved. However, I was "turned away" because I was too open-minded. I didn't want to be initiated (which they say isn't necessary. Yeah right!) and exclusive to them. So I was treated like crap. They pretend they're full of love, but it's just a facade. If you don't agree with them on most topics and if you're not like them, you're nothing.
But moving on ... Wicca is not the source of witchcraft, and Wicca isn't the only religion that practices witchcraft. Witchcraft, spell work, magic(k), etc . has been around for ages and ages. It's something everyone does everyday. Witchcraft, in it's simplest form, is power of thought.