I read the Satanic Bible as a kid, and I must say that it's far from what most people believe it to be.
Hell, I mostly agree with what's said in the first part (the philosophic part) and apply some of those principles to my everyday life, while totally disregarding the second part, which is about esoterism.
Mr LaVey idea was that most human still need some magic in their lives, and that's why he included the rituals in his bible.
As he said, "Satanism is nothing but Humanism, if it weren't for the rituals." (or something like that.
So I guess I'm a humanist, which suits me fine.