They are in lack of real leader. Take Datong city in Shanxi as example, my mother and I paid a visit there during Chinese New Year and attended a church gathering. I found it a heresy. However, it's the only house church there. Datong is a place with rich cool mine.
Coal miners are very superstitious.
They keep household gods at home. Beside Datong, idol worship is very popular in China. Church is powerless. Believers are not well fed and quit from church. Pastors are not able to perform their leadership and have disputes.