Basically, the idea is to have Christianity grow in Japan to the point that it's the second or third largest religion in the nation behind Shintoism or Buddhism. For added points, one could give some ideas for how Japan would develop as a nation in the 19th and 20th century as a result.
AHC: Larger Christian Minority in Japan
- Thread starter Duke Andrew of Dank
- Start date
No Shimabara rebellion could help, also if you reduce the influence of the Dutch we could an eventually catholic Japan.
The Dutch tried finally convinced the shogun to ban Catholicism, one of the triggers of the Shimabara rebellion
More Koreans? 
(sorry, just about every Korean I've ever known is an avid Christian...)
(sorry, just about every Korean I've ever known is an avid Christian...)
Define 'Christian'.
Bluntly speaking, an imported clergy beholden to imperialist powers or even under the authority of some high priest on another continent is going to cause a dangerous degree of friction (the French model of Gallicanism has been proposed, but the French crown had both veto power over the selection of the Pope and an army in marching distance). You are going to need a native episcopacy or go fully 'low-church' for Christianity to end up a solid part of the Japanese theological mélange, and even then expect a lot of syncretism.
Yes, I proposed the idea of Chinese 'Nestorians'/CotE sorts fleeing persecution and setting up shop in the 600s or so a while back....
A Repentant Heretic
Banned
It's still only around a quarter of the population (Protestant, Catholic, and the rest combined), while over half of the population is an atheist/agnostic/cultural Confucian.More Koreans?
(sorry, just about every Korean I've ever known is an avid Christian...)