As Dover First Parish pastor David Slater wrote in 1983: “Christianity is becoming more and more counter-cultural. In the 1950s public values were largely Christian values (even Protestant Christian values). Today we are more religiously pluralistic, but even more importantly, more secular. We can no longer assume that the values of the church will be shared by the larger society.”
How prophetic, considering where American society is today.
And how ironic, considering that his congregation embodied the common culture the Quakers in my book were countering.
Jnana's Red Barn 
Francis Schaeffer was referring to our society as “post-Christian” by the early 1970s. Given Schaeffer’s popularity at the time, I would suspect David Slater had read his work.
I wouldn’t be surprised. It was a shocking concept at the time.