In all seriousness, what is the difference between a fake priest and a "real" priest? Do you really need a degree to make up facts? Is Mark Twain a fake writer because he didn't finish college?
The idea that a preacher / priest / Christian teacher doesn’t need authority from the Catholic Church comes from the Protestant tradition (which has been much more influential in the Anglo-American world) and is why you get much more variety in the forms of American Christianity.
If other well read people really want to suss out a fake, they can do that quickly.
But even during a 4-hour dinner party there'd be no reason to go in weapons hot: it'd be small talk and light conversation.
Choose better examples next time you want to be snarky, please.
There are also degrees in theology for church of England priests for example.