China has 5,000 years of traditional culture, especially Confucianism, while Buddhism has only 3,000 years of history. Why do they have many similarities?

Because Confucianism and Buddhism have the same Hinayana foundation. Before Buddhism was introduced into China, China was the two traditional cultures of Confucianism and Taoism (not to mention the non-mainstream culture in the Spring and Autumn Period and the Warring States Period). Everyone has the foundation of Confucian ethics education and Taoist causal education at home. After Buddhism was introduced into China, Hinayana Buddhism gradually disappeared, because Confucianism and Taoism replaced Hinayana Buddhism, and China people were deeply rooted, able to accept Mahayana Buddhism and had the certificate of practice. Buddhism gradually combined with Confucianism and Taoism and became a part of China traditional culture, enriching China traditional culture. Although Buddhism has only a history of more than 3,000 years, its theory is extremely profound. Judging from the causal laws of three generations, Buddhism covers more than 3,000 years and transcends time and space.