I actually find it difficult to accept that anyone truly believes things, but I'm willing to suspend my disbelief and go with the hypothesis that there are those who are sincere and maybe do.
Am I willing to accept that someone sincere would do what is necessary to climb a corporate ladder? (because all corporate ladders are the same)
Am I willing to accept that someone who is aware of all the crimes, sins, corruption and coverups is still "sincere" when they have reached the top?
No, no I am not.
It's all an act, no different to all the other TV evangelists who put on a show but clearly don't believe what they are selling - it's an act to take money from the sincere believers at the bottom.
Anyone who was sincere would shut it down when they reached the top. The fact that there has only been one GB member who had a Crisis of Conscience tells you how rare that is, and how self-selecting the climb to the top is. Maybe he was an anomaly as he might have got their from family relations.