Final answer:
Historical records do not provide explicit percentages for religious adherence in Feudal Japan; however, both Shintoism and Buddhism were key religious traditions during this period, deeply intertwined within Japanese culture.
Step-by-step explanation:
The question regarding the percentage of Japanese people who claimed Shintoism as their religion during Feudal Japan cannot be answered with a specific percentage like those provided in the options (A) 25%, (B) 50%, (C) 75%, (D) 100%. This is because historical records from the period do not quantify religious adherence in percentages. However, it is known that during Feudal Japan, there was a blend of religious beliefs and practices where Shintoism was very prominent alongside Buddhism, and both religions coexisted and intermingled extensively in the culture and daily life of the Japanese people.
During the Yamato period, the two religious traditions practiced in Japan were Buddhism and Shintoism. Shintoism is an indigenous religion of Japan that includes a veneration of ancestors and the divine forces of nature, and it remained a key religious tradition throughout various historical periods, including the Heian period and beyond. Buddhism also held a significant place and was even promoted as a state religion under rulers like Empress Suiko.