A Call To Prayer

Why does Paul say all men have not faith but the LORD is Faithful? How is it prideful to think you don't need the prayer of the people of God? How did the LORD use sinners when writing His Word while still maintaining error free unity? Was the apostle Paul error free or do we do wrong trying to elevate him above others? Was the LORD at work adding His chosen to His church even when Paul was being chased from place to place? Does there have to be an established missionary in a place in order for God to call out His chosen? How can we say we are truly 'brethren'? What is 'prevenient grace'? Is there any distinction among the children of God?