I think most people these days who go to church or another place of worship are not true believers they are the equivalent of PIMO JW. I know this is true of most Jews and Muslims too. Probably Buddhist and definitely all other sects have PIMOs or PIMQ.
It’s not that much of a toll. All through history you had groups get together in the name of religion or something similar and many just go with the flow for the sense of community and companionship. That’s why I’m still physically in but mentally out.
I suspect there are a high percentage of those physically in that have doubts but go with the flow. Even if not all of them view themselves as PIMO they may just think well I don’t know I hope what we believe as JWs is correct but we’re probably not correct about everything