The iniquity talked about in Revelation has occured, occurs currently, and will continue to occur. Revelation has predicted more about human nature and the nature of government than climate change scientists could ever hope to.
Or non-religion is a precursor to the kind of moral weakness that stunts a natural desire to reproduce? Maybe those who believe they are bringing souls into the world, rather than bags of meat and water, tend to have a more positive outlook on having children? Maybe those with no religion let the media's doomsday climate change scenarios become their version of Revelation?