The remnant that God chose to save were those that were righteous in his eyes. Those like Noah, Daniel and Job. 

Why? So that they could live a life of example to others. So others could find comfort and hope. 

The same reason you, child of God, are here. You are a beacon of light, an anchor someone can turn to in times of need. You are here to glorify God and benefit others. 

Scripture taken from:

Ezekiel 14:19-23