In Neo-Shintoism, ancestor worship plays a significant role in the philosophical interpretation of Shinto. Ancestor worship, also known as "kami worship," is the belief that the spirits of one's ancestors continue to exist and can influence the lives of their living descendants. This belief is rooted in the Shinto concept of kami, which refers to the spirits or deities that are present in all things, including humans.

One of the main reasons for the importance of ancestor worship in Neo-Shintoism is the emphasis on the interconnectedness of all beings. In this belief system, ancestors are seen as a vital link between the living and the spiritual world. They are seen as guardians and protectors of their descendants, and their guidance and blessings are sought after in various aspects of life.

Moreover, ancestor worship also serves as a way to honor and show gratitude to one's ancestors. In Neo-Shintoism, ancestors are seen as sources of wisdom and guidance, and their spirits are believed to reside in the family's ancestral shrine. By offering prayers and rituals to their ancestors, followers of Neo-Shintoism express their respect and appreciation for the sacrifices and contributions made by their ancestors.

Additionally, ancestor worship also plays a role in maintaining familial and societal harmony. In Neo-Shintoism, ancestors are believed to continue to watch over and guide their descendants, even after death. Therefore, it is essential to maintain a good relationship with one's ancestors to ensure their continued protection and blessings. This belief promotes a sense of responsibility and duty towards one's family and community, leading to a more harmonious and cohesive society.

Furthermore, ancestor worship in Neo-Shintoism also serves as a way to preserve cultural traditions and values. By honoring their ancestors, followers of Neo-Shintoism not only maintain a connection with their past but also pass down their cultural heritage to future generations. This emphasis on cultural continuity is essential in a rapidly changing world, where traditional beliefs and practices are often at risk of being lost.

In conclusion, ancestor worship holds great importance in Neo-Shintoism as it promotes a sense of interconnectedness, gratitude, harmony, and cultural preservation. It is not just a religious practice but also a way of life that fosters a deep appreciation for one's ancestors and their influence on one's present and future.