Shintoism isn't spreading throughout the world. You are confusing Shintoism with Buddhism. And Buddhism is spreading among Atheists as a philosophy, not as a religion. The metaphysical and esoteric elements of Buddhism aren't being believed in in Christian countries. About freedom, let me remind you that Modern Democracy, Free Speech, Freedom of Press and Freedom of Faith are all social concepts invented in Christian countries and not in Japan and Japan would've never invented these concepts because you people lack the cultural foundations to invent these concepts.