Buddha also established a new religion, and Confucius renewed morals and ancient virtues, but their institutions have been entirely destroyed. The beliefs and rites of the Buddhists and Confucianists have not continued in accordance with their fundamental teachings.

‘Abdu’l-Bahá, Some Answered Questions, p. 165-166

The meaning is that the Buddhists and Confucianists now worship images and statues. They are entirely heedless of the Oneness of God and believe in imaginary gods like the ancient Greeks. But in the beginning it was not so; there were different principles and other ordinances.

‘Abdu’l-Bahá, Some Answered Questions, p. 166

As regards Confucianism, the Teachings contain no data on this subject, and the Guardian would therefore advise that you refer to authoritative books regarding the history and teachings of this Faith.

Shoghi Effendi, Extracts From The Bahá’í Writings And From Letters Of The Guardian And The Universal House Of Justice On The Old And New Testaments

Confucius was not a Prophet. It is quite correct to say he is the founder of a moral system and a great reformer.

Shoghi Effendi, The Compilation of Compilations vol. I, p. 21