" I see why it is so hard to get an accurate accounting of true membership. "
It would be interesting, but impossible, to get a true number of really active members, we know from our own experience, and evidence from others on here, that most Field Service Reports are mainly works of Fiction.
It obviously is also totally impossible to estimate how many - if any at all - are 100% believers, with no doubts at all. The ones I have spoken to who I thought were 100% believers in all the Bullcrap turned out to have doubts, and some said they would not do certain things even if expected of them, like Shunning.
So,despite the numbers claimed, the Org has a problem with real commitment.