I know in one of their books they explained the notion of Sand: A colony ship with an AI crash landed on a distant world. The survivors managed to start their own settlements and form a sort of Old West frontier type culture. The AI, adhering to its programming to "care" for its charges and instilled with religious mythology, creates and sends out a series of increasingly dsyfunctional 'prophets' - androids or cyborgs or some kind of trans/posthuman. The problem being that the descendants of the survivors have no need for these 'saviors', hence the numerous attempted executions.
Essentially, Phorr is out there, trying to bring people back to the crashed ship as a kind of heaven/paradise, and they don't really want to go. He is also upsetting the local religious figures because while they offer people a metaphorical heaven in the afterlife, he's offering one that can physically be reached.