Vanitys_Fire, Perhaps before you go trashing Wicca it would help if you actually talked to some long-term Wiccans to see what it is that they truly believe and practice because your information is off the mark by quite a bit.
First of all, it isn't true at all that experienced Wiccans try to hide the history and beliefs of Wicca from someone new who is trying to learn. I've been a practicing Wiccan for 30 years. I am also not someone who is simply book taught. I am both a 3rd degree initiate of the Oak, Ash, and Thorn Tradition AND a 2nd degree initiate of Gardnerian Wicca. I'm always willing to discuss the history, beliefs, and practices of Wicca with anyone.
Yes, it is true that Wicca is a modern religion founded by Gerald Gardner in the 1930's. (He made it public in 1954 following the repeal of the Anti-Witchcraft laws in England.) Modern Wicca is a blend of British folk magic, Western esoteric traditions, and Masonic rituals. So what?? Every religion was new at one time. What is more important is that Wicca is meeting the spiritual needs of thousands of practitioners world-wide. If Wicca didn't work it wouldn't still be alive and growing. It may not be the right spiritual path for you, but that doesn't mean that you should trash it. Especially since you seem to know little about it.
Gardner was neither warped nor a dirty old man. He was a respected British Civil Servant. He also had a very dry sense of humor and liked to pull the leg of the press at times. Anyone who practices Wicca...whether they are a Gardnerian or some other Tradition...owes a tremendous debt of gratitude to Gardner.
Wiccans do not necessarily believe that "All Gods are one God and all Goddesses one Goddess". That concept was put forward by Dion Fortune..who was Christian, not Wiccan. What Wiccans do believe is that our religion is experiential. That means that each of us has a personal experience of our relationship to the Gods and can then make up our own minds as to what the nature of the Divine might be. Personally I am both Wiccan and a hard polytheist believing that the Gods and Goddesses are all separate individuals in their own right.
The Law of Three (Often mistakenly called Karma) is not about punishment and scaring people into being "good". While many people...such as yourself...interpret it to mean that if you are hurting someone you will be hurt three times, that is not what the Law of Three is telling you. What the Law of Three tells us is that our actions have consequences and that those consequences effect us physically, emotionally, and spiritually. Hence the "threefold". There is no punishment involved, merely a result of our own actions.
Nor does Wicca say that we cannot do "harm" although many not familiar with Wiccan teachings think it does. In the Wiccan Rede it says "AN it harm none, do as ye will." In this case the word "AN" should be read as "if". So IF an action isn't going to do any harm then you are free to do it. The Rede is silent on actions that cause harm, leaving it up to the individual Wiccan to decide what the ethical response to any given situation might be. If a Wiccan feels that a baneful act is truly necessary and they are willing to accept the possible consequences of their actions, then no one is going to come along and pull their Wiccan privileges.
Probably the one statement that you made that was accurate is that Wicca and Witchcraft are two different things. Witchcraft is a magical practice that may or may not be a religious one. Wiccans practice witchcraft and are therefore Witches. BUT, of course not all Witches are Wiccan. Heck, not all Witches are even Pagan. While some practice Witchcraft as a Pagan religion, that doesn't seem to be that ancient of a practice. There is some indication of Witchcraft as religion in 14th century Italy, that seems to be an aberration. Most Witches in the past were followers of the religion of the area they lived in. I'd suggest "Triumph of the Moon" by Ronald Hutton for an overview of the rise of religious Witchcraft.
Finally, saying at the end of the post that you don't mean to offend by your post does not remove the responsibility you have for thoroughly trashing a religion about which you obviously know very little and which means so much to so many people.