The history of the kakure kirishitan and various Catholic samurai in Japan is quite pathetic. It's said that St. Francis Xavier found Japan to be wonderfully promising mission territory.
It is also interesting to note that the Catholicism the 'hidden Christians' were confronted with in the 19th Century differed so much (in their view) from what they had learned in the 16th and 17th. There seem to have been drifts in attitude on both sides: the kakure kirishitan were of course unable to stay doctrinally sound during the intervening centuries, while the Europeans had apparently, under the growing pressure of the Enlightenment, banished traces of 'medieval superstition' and 'lingering paganism' from their belief and practice.