Nothing more galling to have the Holy Christian City of London with 22 population get drive by converted by a prophet on a speedboat in one turn...
...but the annoying thing is how they will yell at you hardcore after converting one of their cities but you can't do anything when they prophet bomb your holy city.![]()
I do think the human player should have the same "I see your units at my border, so DOW now or promise that you're just passing through" challenge right the AI has. When G&K came out, human players didn't have the "stop proselytizing" demand, but they added it in the Fall patch. Hopefully, any expansion (or other future patch) will add the "units at border" challenge right.