New listener here!
To me what I found really creepy overall was the man's assertions that Jesus and God were backing him up on this. Constantly he'd go back to how Jesus had saved him and it was thanks to God that he was able to perform such wonderful works. People who think and talk like that while doing something so cut and dry bad to another person seriously creep me.
As for the boy, I wondered a bit if our dear dentist wasn't trying to harvest his eyeballs to sell on the black market, much as I presume he was doing the same with the girl's kidney(s?).
I loved how the end was written. So often when intoxicated (by alcohol or even just when on a natural high) you do lose the depth perception, and things just sort of float away from you, so you get vague impressions of things and events going on. Even without the alcohol, that's how I picture the dentist wandering through life, he's just disconnected from everything. And it fit so well with my impression of the Mayan people, left to their traditional culture without much outside influence, just as the dentist had left such outside influence behind as he traipsed further and further in (which, from the sound of the narrative seems like he was going further and further back in time, away from the gentler sort of culture that is the Mayan peoples now and back to the ancient mayans, so that it is laughable that he declares himself a god -- even if it is to himself in his musing. Who is he to stand up to any of their old gods, for whom blood flowed freely?). Ancient Mayans did not treat their prisoners kindly.
In the end, I found the story very interesting in that remote staring-at-the-spider-on-the-wall-in-fascination-even-though-it-grosses-you-out kind of way. Live by the sword, die by the sword kind of thing. A strange sort of justice. Kudos to the reader as well, great job!