Bob sees money go in the offering plate...donations given to expand a church building or to fund a mission trip and nothing immediately given back form God in return.
Therefore he believes that the lack of instant religious gratification "makes churches and the preacher shills fair game for criticism and retribution."
Bob is just a rapidly-going-senile doddering old idiot, nothing more than that.
He's also a, uh, lapsed Catholic.
I dunno what it is, but it seems primitives who're lapsed Catholics are more bitter, angry, hate-filled--Ms. Hindenberg, the defrocked warped primitive, for example, or Anne, the dysmenopausal Kansas schoolteacher--than primitives who're lapsed Presbyterians, lapsed Baptists, lapsed Methodists, lapsed Buddhists, whatnot.
The primitives in general are notorious for their hate, but if one encounters one who hates with a vigor and a passion that's almost superhuman, it's likely the primitive's a lapsed Catholic.
I dunno why that is, but it is.