Because all sinned, the purpose of God for people who are sinners is that they might be saved so that they may not perish in sin and perish eternally in everlasting destruction but that they may inherit the kingdom of God. The purpose of God for people who are sinners is that they may come to the knowledge of the truth. This is the (primary) purpose of God for the people. What will it profit a man if he gains the whole world and loose his soul, what will he give in exchange for his soul. Has the purpose of God for people been accomplished in your own life? If not, believe in Jesus Christ the Son of God and the Saviour of the world and He will save your soul and give t eternal life.