Well I'm sorry, but there is no way to know who is actually a wof adherent and who isn't within denominations. Being a teaching type movement, it can be associated at various levels with any denomination out there, but by itself, it is unaccountable.
While this may be true to a certain extent, (that know one knows for sure, exactly how many identify with what beliefs); we can get a pretty good idea through research. Im willing to bet you didn't actually read the articles that I referenced. If you had, you would have seen that they way they came up with these numbers were through research polls, asking a handful of theological questions, such as if one believes that God will give those with faith fiancial blessing, or healing, etc. They also took into account the number of churches that teach what is considered by the critics to be the "Health and Wealth" gospel, and their membership. By doing this, they found, for instance, that nearly 90% of those that were self described Pentecostals in South Africa identified with the WOF message. This same held true for other third world countries where they did the research. Now, this doesn't prove that this is so everywhere, but it is a good indicator.
This of course, doesn't tell us how sophisticated such belief systems are, nor does it take into account ancillary doctrines such as BAJ, JDS, little gods, etc. But it does take into account the heart of the WOF message,
which is that God honors His promises as found in the scriptures to those that have the faith that He will do so.
Of course, this belief annoys and angers most religiously minded folks, and legalistic and works based folks, to no end. It annoys them so much, (the idea that God would simply bless people by faith), that they feel the need to launch campaigns against it. Some get obsessed with it, and cannot leave it alone. They feel that it is their lifes work to force people to quit believing that it is that simple. They do not want people to simply believe God, and receive His promises. That really bugs them to no end.
More power to them. They may as well fight the wind.
Peace...