This is the Slab City, CA Church.

There music has been recorded, you can hear it here online.

Do yourself a favor, listen to it, and also look at the other pictures of the Slab City vicinity.

These form part of an incredible project of someone touring the country and recording religious music. Some of the music is unbelievably terrible but some of it is great.

It isn't all just country gospel, there are twenty categories on this webpage. Some great black gospel too.

There are some good Sullivan Family recordings in the the bluegrass gospel section. It is worth some time poking around (and a willingness to at least briefly expose yourself to some terrible music to get to the good stuff.)