Humans are subject to selection both genetically and memeticly. Some portions of the population have high birth rates. Fecundity in modern environments appears to be partially heritable and can be inculcated to a degree. There is little reason to think human fecundity will not go back to historically normal, Malthusian levels eventually once selection for fecundity takes its course.
One reason to be bullish on religion is exactly this. Secular cults such as Randianism, modern wokeism, and arguably Reform Judaism are (whatever you thing of such idealisms) largely sterile and so unlikely to persist in their modern forms in the very long term.
One reason to be bullish on religion is exactly this. Secular cults such as Randianism, modern wokeism, and arguably Reform Judaism are (whatever you thing of such idealisms) largely sterile and so unlikely to persist in their modern forms in the very long term.