Very rarely do Christian culture people stop at having one or two kids. They like to press on. Sometimes you meet the couple who says "We're going to have as many kids as the Lord wants us to have," which begs the question, why don't you eat all the food in sight? Since it's available it must mean the Lord wants you to eat it.
You never meet a Christian culture couple who says they don't want to have any kids. It does not occur in nature.