I understand that to be true as well. The boss I had last year at the university I work at is a Japanologist, and he says that the Japanese tend to look down on anyone who takes religion very seriously or passionately. They are seen as fanatics. Almost all Japanese prefer a fashionable Western style "Christian" wedding (like in the movies), but they will prefer to have a Shinto ceremony performed for their infants, and the Buddhist priests handle funerals. They tend to not rigidly define "religions" into categories as we do in the West, at least that is my understanding. Christianity has never had a strong presence in Japan, no matter the movement: Roman Catholic, 'indigenous Protestant' attempts, or otherwise.