Rivergang- I totally agree with you. The point In question is the activity rates of the 2 different groups. Those that consistently turn up to their religious denominations and are actively engaged.
I totally disagree that Wt is forging numbers. I think they are perhaps been overly truthful. When you start comparing similar groups, that are also having the same problems. It makes the 8 million publisher count look very reasonable.
In a very broad and general sense I’d that SDA, LDS, JWs, are all similar in membership. Factoring in those that truly believe it. Are in it for family reasons etc.