Religious people aren't necessarily poorly educated, but they are misguided in their believes. Tempest said it well:
Exactly. For example, according to the Christian book of Genesis, verse 1:28, God said to Adam and Eve: “Be fruitful and multiply and fill the Earth and subdue it, and have dominion over the fish of the sea and over the birds of the heavens and over every living thing that moves on the Earth.”
So, Christians take this for granted and use it as an excuse when someone asks them 'why do you have so many children'. Ergo, 'I'm going to have as many children as God wants me to' logic.
Better educated individuals who were trained in the art of critical thinking are more likely to question everything and demand hard evidence instead of just blindly accepting "because it says so in the Bible" argument, like religious people do.
God wants me to have children? Eh? Say what? God? What is this "God" you speak of? Your only "evidence" is some ancient book written by a human hand? Aha. Okay.