Han Chinese culture is most closely identified with which religious tradition?

In ancient times, a lot of Han people were the worshippers of the Buddhism, so they may be identified with Buddhism tradition then.
While, people tend to have various religious belief today, such as Christian, Islam and Buddhism. Therefore, it may be a little hard to tell you an exact tradition.

I won't say this is "Religious Tradition" but they follow the Confucian "religion" and also Confucian ideas.

This is the correct answer