all i know is Confucius founded confucianism, and it started in china.

So it propagated for around 6th to 5th B.C.E followed by chinese people for a millennia.

During the Han Dynasty, emperor Wu Di (reigned 141–87 B.C.E.) made Confucianism the official state ideology

So their beliefs are human centered virtues for living a peaceful life. there are three beliefs of confucianism and those are; Filial piety, humaneness, and ritual. It's main purpose is to achieve harmony the most important social value.

So the reason why this religion was made is because, They want to unite people, create stability and prevent rebellion.