The author find and read over ten rare and treasure handwriting ancient books which books show him something very interesting and important information of the faith of AREMIDA-BUDAYA in Japan. So he compare those ancient books with a modern book-To be a True Believer of AREMIDA-BUDAYA and write this paper. It is his hope point out which part are the same and which parts are differences. Why they have to obey the traditional Master teaching? Why they have to change in order to come to the modern world? And how to do?