One thing is for sure...the WT organization has way less than 5 million adult JWs. They may claim they have 8 million JWs...but that number includes toddlers and children who are between the ages of 6 years old and 12 years old who are included as publishers and a good percentage of these even baptized. So imagine an organization claiming a membership of 8 million when in reality more than a third of that "membership" is less than say...12 years old!
Wow how impressive!