That's wasn't my point and you know it. Being obtuse won't get you very far either.
Actually, I took it as you speaking to me personally. My bad.
Back on your point, pretty much every televangelist does very well with nothing but bible knowledge and a bit of larceny in his heart.
In the broader sense, selling pretty much anything has way more to do with intangibles than facts. This is why diamonds are so expensive when their only real use is in cutting tools. The easy sell is status. Convince your mark that what you're selling is what everyone else wants and you'll get rich. If what you're selling is cheap and common, create a shortage and cash in. Diamonds, trading cards, high end watches, expensive cars, perfume, and high end hand bags, all of those things are symbols designed to show others that we have something they can't have, so people will pay through the nose for them. Peddling religion is no different, it's just that the salesmen needs a blacker heart.