Ryōbu Shinto, also known as Shinbutsu Shūgō, is a syncretic mix of Shinto and Buddhism that emerged in Japan during the 8th century. This unique blend of two major religions has been a subject of fascination and debate among scholars and practitioners alike. While it is widely accepted and practiced by many in Japan, the perception of Ryōbu Shinto by other religions in the country varies.

One of the main criticisms of Ryōbu Shinto comes from the traditional Shinto practitioners, who view it as a deviation from the pure and indigenous form of Shinto. Traditional Shinto emphasizes the worship of kami (spirits or deities) and the connection to nature, while Ryōbu Shinto incorporates Buddhist concepts such as reincarnation and salvation. This syncretism is seen as a dilution of the original Shinto beliefs and practices, leading to a decline in the traditional form of the religion.

On the other hand, Buddhism in Japan has a more tolerant view towards Ryōbu Shinto. This is because Buddhism itself has a history of incorporating local beliefs and practices in the countries where it spread. In Japan, Buddhism has assimilated many Shinto deities and rituals, and Ryōbu Shinto is seen as a continuation of this syncretic tradition. However, some Buddhist sects do criticize Ryōbu Shinto for its emphasis on Shinto deities and practices, which they view as a threat to their own teachings and practices.

Another religion that has a complex relationship with Ryōbu Shinto is Christianity. Japan has a long history of Christian persecution, and during the Edo period, Ryōbu Shinto was used as a means to suppress the spread of Christianity. This led to a negative perception of Ryōbu Shinto among Christians, who saw it as a tool of oppression and a distortion of both Shinto and Buddhism.

However, in recent years, there has been a growing interest among some Christian denominations in the syncretic aspects of Ryōbu Shinto. Some see it as a way to bridge the gap between Christianity and traditional Japanese beliefs, while others view it as a way to reach out to the Japanese people who are more familiar with Ryōbu Shinto.

In conclusion, the perception of Ryōbu Shinto by other religions in Japan is complex and varied. While it is accepted and practiced by many, it also faces criticism and resistance from traditional Shinto practitioners and some Buddhist sects. Its relationship with Christianity is also complicated, with some seeing it as a threat and others finding common ground. However, Ryōbu Shinto continues to be an integral part of the religious landscape in Japan, representing the unique blend of two major religions in the country.