Most of us will agree [...]
Classic use of social pressure. Humans are social animals and statements like this makes us instinctively want to conform to the majority. For example, some cities have started including statements like "9 out of 10 people pay on time" when sending notice of due taxes and this significantly increases rates of payment. So even though it is NOT easy to set aside a couple hours a week for family study, and another couple hours to read cult literature, all on top of the hours and hours of time spent at meetings and out recruiting - despite all that people will want to conform. They'll try to follow along and feel inadequate (and even more in need of the cults help to find redemption) when they fail. Classic cult technique - create the problem, then present yourself as the solution.