Why does God command us to have children?

> Genesis 1:28 > > Easy-to-Read Version (ERV) > > 28 God blessed them and said to them, “Have many children. Fill the > earth and take control of it. Rule over the fish in the sea and the > birds in the air. Rule over every living thing that moves on the > earth.” There are so many Christian concepts that make me scratch my head as to why God wants us to have children. Things like the ruler of this world is Satan, Christians must suffer in this world, we are anxiously waiting for Jesus' return and the rapture, fighting our carnal nature of a fallen world....etc. Wouldn't it be better to leave unborn children wherever they may originate from? **So what is the reason God wants us to have children?** (Also, if you happen to known - does God ***NOT*** want non-Christians to have children?)