During the Sengoku period, Catholic Christianity was growing at an extraordinary rate. I'm wondering how under the right circumstances, how much of Japan could become Catholic? 10%? 33%? 84%? Oda Nobunaga can live in a potential scenario, or Ieyasu loses Sekigahara, etc. Also, what would Catholic-Buddhist relations in Japan be like then? Foe example, Nagasaki in OTL did have a ton of Catholics, in fact it was called Rome of the East. Would Catholicism in Japan go the way of Indonesia, or Germany? Indonesia style would be an almost total conversion from the old faith to the new (from Hinduism and Buddhism to Islam), while Germany style is how in various provinces, the religious make-up differed, and so you have a Protestant majority and Catholic minority, but both populations are substantial and not the overwhelming majority (the majority but not overwhelming majority of Germans converted to Lutheranism).