Who are these strange people in Wise Blood?

Who are these strange people in "Wise Blood"? In most novels, you get to know the characters over the course of the narrative so that what seemed strange and incomprehensible early on gradual takes on a clarity and a comprehensiveness - we know the whole character, not just a fragment. Flannery O'Connor, in so many ways, is different and unconventional. Her characters in Wise Blood - Hazel Motes, Enoch, the blind preacher and his daughter - become even stranger and in a way less comprehensible as the story proceeds. We learn facts about them along the way - the blind preacher, surprise!, is fake, he'd planned to blind himself as a testament to Christ but he lost his nerve and since then has pretended to be blind - but we don't exactly know what drives them. hazel in particular: what is it that makes him travel around the city announcing that he preaches for the Church without Christ? What drives him or possesses him? The preacher and his daughter are more obvious - they're scam artists, as out of some 30s screwball movie (e.g., The Lady Eve), but less comic. Why they'd set their sites on an obvious loser like Hazel is the puzzle. Maybe the looks wealthy to them? Enoch is just needy and lonely. As noted in previous posts, something is building or proceeding on the allegorical/symbolic level, but it's like trying to see the shoreline through a haze - something's there, but the outlines and dimensions are not yet clear. Even when or if it does become clear, I'd expect that this novel is not designed like a Swiss watch - it's more of a loose structure, peripatetic within a small scope.