Six Letters to a Pious Man, by Heinzen, Karl. Written over a century before Dawkins wrote The Selfish Gene.
Six Letters to a Pious Man, by Heinzen, Karl. Written over a century before Dawkins wrote The Selfish Gene.

archive.org
Six letters to a pious man, introduced by an address to Bishop Hughes : Heinzen, Karl, 1809-1880 : Free Download, Borrow, and Streaming : Internet Archive

The author is a "48er", one of the people in Germany who were exiled after the Revolutions of 1848. There's some really interesting stuff here.