This was not that God could not overseas the affairs of these things (both living and nonliving) but he needed a representative who will serve as an intermediary between other creatures and God. God needed Obedient Child. Obedience, the only key to walk with GOD. To make the relationship between man and God stronger, God demand of us that we obey HIM. Keep his commandment and do HIS will. God needed people to use as vehicle of evangelism. Evangelism is often regarded as the heart beat of God. Just as God who reign on high speak to men in days old, so he speak to us this day. All we need to do is Just obey him