Might be useless, but whatever…
Evergreen book from 1850s discussing religion/depopulation
Found it from a simple GOOG search.
https://books.google.com/books?id=VOURAAAAYAAJ&pg=PA202&lpg=PA202&dq=evergreen+depopulation&source=bl&ots=-mYFTX_S89&sig=ACfU3U3Vnx_yp7lXCAPj60fIw1NnLe6fJg&hl=en&sa=X&ved=2ahUKEwjbtYPbvMznAhXNrVkKHdyPBDEQ6AEwAnoECAkQAQ#v=onepage&q=evergreen%20depopulation&f=false