Is the yin in the countryside really to let the dead possess and talk to the dead?

I don't know from which angle you asked, but if you look at it according to materialism, it is a lie and a performance.

If you look at monotheistic religions such as Catholicism, Orthodox Christianity, Islam and Judaism, if you don't lie, you are definitely making friends with ghosts and dealing with the devil, because it is not your relatives who are possessed, but the devil who pretends to be possessed, because after death, Yin and Yang are separated, and no matter whether the deceased is in heaven or hell, it is impossible to have any connection with the world. That's impossible. It is the devil who lures superstitious people to hell by missing their loved ones.

Of course, most local religions in China admit or don't deny Yin, but there is no denying that monotheism has some truth, because even without the temptation of the devil, this superstition is easily faked by God's stick. It is an opportunity for people with ulterior motives to take advantage of it. The most famous one in history is Unique by Yang, the East King of the Taiping Heavenly Kingdom.