Because Confucianism believes in One God(Ti'en aka Shang Di), & also practices ancestor worship.
And Ancestor Worship.
Mostly Ancestor Worship
Some forms of religion involve the worship of one's ancestors. In such a religion, the religious rituals would be ancestor rituals.
E.B.Tylor
Robert John Smith has written: 'Kurusu' -- subject(s): Case studies, Family life surveys, Rural conditions, Social change, Villages 'Ancestor worship in contemporary Japan' -- subject(s): Ancestor worship, Ancestor-worship, Japan, Religion, Religion and sociology
The Sioux believes that all life is deserving of respect. They don't exactly worship nature, but they do have a healthy respect for it and the animals.
Mosques or Masjids are the place of worship for the Muslims who follow the religion of Islam
Those who practiced the Shinto religion. Some Buddhists do this as well.
The religion of the people in the Huang He River Valley was a mix between ancestor worship and animism. Ancestor worship was important to kings and nobles. They communicated with them through oracle bones. They also worshiped their ancestors by bringing food and wine to various temples. People of the Huang He thought that when someone died, their soul went on to the afterworld, and they believed their ancestors had magical powers.
Tribal religion. Melanesian believe in gods and spirits - reverence to ghost and ancestor worship.
If you don't count Confucianism as a religion then, chinese folk religion, with a LOT of different gods and goddesses and ancestor worship