From GA 400, you must turn West (right if headed south/left if headed north) on Highway 53. 

Approximately one mile out from GA 400 you will see the church situated on the side of the mountain. 

However, you cannot access the location, until you reach Etowah River Road. 

This is an intersection of Etowah River Road to the right, and Thompson Road to the left. 

Turn right on Etowah River Road, and continue about 1/8th of mile to a private drive on the right which is 100 Cornerstone Court.  There is a mailbox there with 100 on it. 

There is a church sign at the intersection of 53/Thompson/Etowah, and also on Etowah at Cornerstone Court.