Current status of the Local Church?

I have relatives who accepted Christ as Savior in the mid 70's. Their lives and personalities started to change positively. They then became involved in the local church, which they are still involved in, and they became distant from the family, somewhat argumentative and critical. One of the members seemed to be coming out of lifelong depression after first becoming a Christian - appearing happy, until they started with the local church. Now, after almost 40 yrs in that cult, depression and withdrawal seems to characterize the personality.

I have frequently prayed for the cult's deliverance from deception. I'm wondering if anyone knows whether the local church is increasing or decreasing in numbers. Also, does anyone know if perhaps individual churches are seeing their doctrinal errors and turning away from them to true Biblical Christianity? Are there particular states or cities where people are coming out and/or changing their fellowship's beliefs?