The Ohio Anglican has the full scope, but I found this part interesting.
A promising beginning to those missions—perhaps as many as 300,000 Christians by the end of the sixteenth century—met complications from competition between the missionary groups, political difficulty between Spain and Portugal, and factions within the government of Japan. Christianity was suppressed. By 1630, Christianity was driven underground. However, when Japan was re-opened to Western contacts 250 years later, it was found that a community of Japanese Christians had survived underground, without clergy, without Scriptures, with only very sketchy instructions in the doctrines of the faith, but with a firm commitment to Jesus as Lord. (I remind you that 250 years is a long time — 250 years ago Americans were loyal subjects of King George II.)