I've played a few campaigns around Kyushu now and the Jesuits always turn up. A Nanban trade port creates something like 3.5 conversion per turn. You'd need a high level Shinto/Buddhist building and a couple of monks to keep conversion down, if not at zero.
I started off wondering what the point of turning Kirishitan was, given the immediate hostility from other Daimyos and exhorbitant cost of imported weapons. But, as I get more used to the game's pacing -that essentially you will inevitably end up at war with everyone, I'm questioning this a little. I think the nanban trade bonus may squeeze more revenue out of fewer trade routes and perhaps more useful to the long march to 40+ provinces, turning the population against Shinto daimyos (with a host of Kirishitan monks) could well prove a much more powerful weapon than Buddhist monks.
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