[Population] growth didn’t stop being a blessing after that. Instead, it was promised as a blessing on Israel’s obedience: “And He will love you and bless you and multiply you; He will also bless the fruit of your womb and the fruit of your ground, your grain and your new wine and your oil, the increase of your herd and the young of your flock, in the land which He swore to your forefathers to give you. You shall be blessed above all peoples; there shall be no male or female barren among you or among your cattle.” (Deut. 7:13; cf. 30:5). In contrast, a decline in population was one form of curse God might send on His people if they rebelled (Deut. 28:62, 63; Lev. 26:22).
My two cents
I was told by humanistic people, environmentalist bloggers, and those on the political left that population growth is, in effect, wrong. It can be easy to be swayed by people of that ilk if you’re unaware of their worldview. I wonder how many parents make an effort to explain to their children the difference between the Christian and humanistic worldviews. Of the parents that send their children to a public school, I don’t know if many parents would stop to think about it. In my case, I was taught a lot of useless, quasi-academic stuff by my teachers—I guess that’s the result when education and curriculum are politicised by the state. Then all the while I had to figure out worldviews by myself.
Back to the topic of population, one group of people who override the anti-population growth mantra are the Amish (one of my favourite groups of people). This article from the Wall Street Journal says that the population of the Amish has doubled since 1991, and I think that’s good news.
Beisner, E.C. (1990). Population Growth as Blessing or Blight? Available: http://www.reformed.org/webfiles/antithesis/index.html?mainframe=/webfiles/antithesis/v1n4/ant_v1n4_growth.html. Last accessed 12th Mar 2012.