There's a few assumptions in the question of the OP.
One is that they are deluded. In my opinion, they are not (at least not all of them)
The geebee is certainly not swindling, lying, controlling on accident due to some mistaken belief. I suspect some or all of them don't even believe in the bible/god/Jesus. I have no problem with that lack of belief generally but in top leadership of a religion, it should be a prerequisite.
In a cult, belief/fear of a deity could cause you to not want to purposely be an a$$hat to millions worldwide and would not be conducive to top leadership.