Religions listed in order of the number of adherents, largest first. List is taken from http://en.wikipedia.org/wiki/List_of_major_religions
It is an unreliable source as anyone can change it. It isn't allowed to be used for academic purposes and therefore you shouldn't rely on it. The fact that you said your list went from biggest to smallest is already wrong. Christianity isn't the largest religion on the world, it just seems that way because we get in everybody's faces.
The estimates for Rastafarianism's population is about 20% larger than those for Wicca's. According to Wikipedia. Are you just making things up, Xyle?