I am not sure of the numbers of these liberal churches but I can speak to my Presbyterian Church of America (PCA) church and bible-believing churches in my area. My church has sustained a 10-20% annual growth rate over the last ten dollars. In my area bible-believing protestant churches are doing quite well. So I would not paint such a broad brush.
I am glad for you and the people in your area. There must be a line at some point where good churches of these organisations, who have become apostate, remove themselves from them or become infected by their lies. I would suggest the line has long since been crossed. “Come out of her my people” seems very appropriate in these times.