This is a new idea that I want to explore: a possible correlation between religious belief and overpopulation. This isn’t something that I think is really happening to a large degree right now, but is just a thought.
1) If the ultimate aim of a religious belief such as Christianity is for humanity to end up in heaven (wherever a particular sect believes that to be), then I can see a strong link between religious belief and having large numbers of children. In fact it is common among conservative Christians and Catholics for having large families already. This may be due to other factors, such as disdain for contraception and abortion, but a view that having children is inherently a good thing could also be a factor. There is also the matter of the explicit command in Genesis 9:7 to: “be fruitful and increase in number; multiply on the earth and increase upon it.”
2) If a religious belief has an element of this tendency to overpopulate in it, then the religion to me seems strongly anti-conservationist. If procreating and making more children to go to heaven, even if not the primary goal is seen as worthwhile in and of itself then the wellbeing of our ecosystem and future of our planet and longevity of our species is being put at risk.
It is undeniable that earth is facing a population crisis; the global human population has doubled in the last 50 years, and will double again in the next 50 years. In current news, the Brazilian government tried to pass legislation that would allow them to cut down substantial portions of the Amazon rainforest. Undoubtedly, this is a flow on effect from a demand for space and resources for a growing population.
C) If a religious belief is anti-conservation, even if indirectly by encouraging having lots of children, then that religious belief is in my opinion detrimental to humanity.
Note: This is not the logical fallacy known as an ‘appeal to consequences’, as this argument stops short of declaring that because of the consequences it is false. I am merely drawing the conclusion that religious belief that includes an advocacy of bearing large numbers of offspring is detrimental to the future of our planet and species.