Do yourself a favor, and read some of the masterpieces written by former communists. Thank you, kindly, but to what end? You have proved my point!
Why do you think, despite McArthur's efforts, there's barely 1% of Christians in Japan, but the country en-masse changed their political ideologies?
Did they? If you look closely, historically, Japan only changed while under occupation and returned quickly to previous trends...which is in part the economic anchor that is around it's neck this day.