Paganism is older than the hills. Neopaganism means people who aren’t dead yet are following it. Wicca is the same deal, just in a unified package. Really, “neo”-paganism is older than all of the world’s major religions put together.
The thing is that Wicca is not (as far as I understand it; I have more experience with non-Wicca paganism, which isn’t much experience either) “a religion” in the sense that Christianity, Judaism, Islam or Hinduism is a religion with a generally agreed-upon set of rules, values and customs, which vary only through differing interpretation of the same general ideas. Wicca/paganism is really just everything else. If you follow a God that most Americans don’t think about outside of a historical context, odds are you’re a pagan and you could call yourself Wiccan if you wanted to. While Christianity means basically the same thing to its adherents (give or take a wide variety in politics and means of prayer, etc.)–the crucifixion story, the savior shtick and all that–Wicca/paganism pretty much means anything you want it to mean. “Its” followers are united only by the fact that most religious people don’t understand them and they’re outsiders in the American spirit-believing scene. Thus, paganism and Wicca in particular (the latter having something of a fad status in some parts) are prone to hooking people who are used to being different from the people around them anyway and/or like being different from the people around them, who stand side-by-side in their faith with those who have been led to Wicca/paganism by the traditional means of being born into it, dreaming about it, being “inspired” etc. And their religion is no more “real” or “fake” than anyone else’s, even though the religious faiths most Americans identify with assert rather forcefully that their God is the only valid one.
It’s an interesting dynamic because Christianity and Judaism in particular are quite adamant that not only are their deities the only valid ones, but that worshipping any other deities is in fact an awful sin. Once you take this position, it’s almost automatic to either dismiss such a free and open “religion” (remember, I’m only using quotes because the definition of religion is so different) as silly (which we’ve seen in this thread) or to be terrified of every aspect of it as being evil. It’s rather funny, really. I was in boot camp when I learned all this stuff, and I used to meditate with my buddy who considered himself a pagan. Just the mention of having had a pagan friend is enough to get a horrified gasp from many followers of Western religions, even though he was a funny and very moral guy who they probably would’ve loved. Anyway, we used to meditate (fully clothed and dry) in the shower or the toweling-off room, as they were large and empty (of furniture) and mostly quiet. The more observant Christians from more “traditional” places like the Lower Midwest and the South (my pagan friend was from East Hick Town, Georgia, BTW) were really scared of us and our meditation, and asked the TIs (drill sergeants) to make us stop. We got all kinds of lectures (from our fellow trainees) about how meditation was evil and this Bible passage and that Bible passage could be vaguely interpreted to say so. But I knew for a fact that lots of “good” Christians and Jews meditated, and it was painfully obvious that the people who talked at us about this stuff were really just scared because they’d been brought up to believe that anything associated with the worship of gods other than Adonai was fundamentally evil and probably involved some underhanded work of the devil. Frankly I felt sorry for them. But it’s pervasive on our culture; Sunday school beat the idea that it was wrong to betray our Jewish god so well into our heads that I literally could not make “the switch”. My pagan friend informed me that Bacchus had told him through Athena that he (Bacchus) wanted me as a follower. I went to a Wiccan service, then went to a Jewish service and in the Jewish one I felt like I had betrayed my foundation and indeed myself. I now believe, looking back on it, that Adonai, Athena, Bacchus and Jesus were all pretty much hogwash, but it was an interesting ride and I learned a lot.
But generally the decision is coerced anyway, even though the Church (any Church) officially says that you’re old enough by 13/17/19/whatever to make your own decision. I don’t think there’s any age at which you’re considered by some central witch council to be independent enough to choose, or at least I hope there isn’t. That’s the kind of stuff that gets a lot of people believing in wild Phelpsian theories; they get the decision made for them and everyone around them tells them they’re making it themselves (and probably believe it, too).
Really, anyone can learn about their god of choice and follow him/her, and whether or not they’re recongized by some Wiccan organization is pretty much irrelevant IMO.