I call them students.
So he doesn't need to show you the science behind what he was saying, he can just show you the math behind the bookkeeping.
And you too will come away a believer ;).
What I have read of the writings of the people that the Catholic church venerates, especially from pre-modern times, I find they strongly smack of sincerity when they talk about metaphysics (like resolving theodicy, or the "limbo of the infants", etc). They argue so passionately, and in such convolutions. And people have chosen to be burned at the stake, just to avoid saying "Yeah, you're right, I was wrong about God, I take it back." Those people, at least, must really believe, at a profound level.
Mind you, I find that they strongly smack of insincerity and self-service when they talk about worldly matters, like excommunicating kings for applying new taxes, or taking sides in WWII, or the whole condom thing, or dealing with accusations of pedophilia, or....
Such a surprising juxtaposition. Other churches seem to me to exhibit similar patterns, although few western religions have had a chance to build up such a legacy as the Catholic.
What would happen if a pope (no capital, and it's not a typo) would abdicate saying they no longer believed? Or if a pope would attempt to dismantle the church and spread their belongings amongst the poor?
Question: Do you ever run into customers who know nothing about software, and are demanding a capability that doesn't exist? Sometimes these customers will argue, and tell you that you are wrong, despite the fact that you have orders of magnitude more knowledge on the subject than they do. I call these people arrogant fools.