The interference these two religions have on the governments of various nations is very evident. Look at countries such as South Korea and Philippines in Asia. The church has forced the government to shelve plans for popularizing family planning.
South Korea does not need any more "family planning" They have yet to recover from the last round of such policies.
South Korea Demographics
https://www.pop.org/content/south-korea-%E2%80%9Cgoing-extinct%E2%80%9D
The near-term demographic future of the southern half of the Korean Peninsula looks grim. Assuming that the current low-low fertility rate of 1.19 children per woman continues indefinitely, as NARS did, the population of South Korea will dwindle to less than half its current size by the end of the 21st century. It will go from 50 million down to 20 million, losing 60% of its population in less than 100 years..
South Korea’s low fertility is in large part the result of American efforts to combat “overpopulation” by exporting so-called “family planning” programs around the world. In South Korea, as in so many other countries, these efforts had a coercive element as families who dared to have more than two children were punished in various ways.[1]
Population control efforts in South Korea proved all too successful, and South Korean fertility rates plummeted from around 6 in 1960 down to a shockingly anemic 1.2 children in 2004. Even after overt anti-natal policies were discontinued in 1996, the fertility rate did not recover, but continued to drop.
[1] Mosher, Steven W. "The Crisis of the Empty Cradle." Population Control: Real Costs, Illusory Benefits. New Brunswick, NJ: Transaction, 2008. 20-25.
I have yet to see any demographic breakdown of the Christian vs the non Christian populations of South Korea but near universal trend globally is that Christians are more resistant to such demographic implosions. Christianity is already one of the largest religions in South Korea and I suspect that trend will only continue.
