Adam sinned, he disobeyed God, and we, his 'children', have sinned ever since. Jesus Christ, God's Son, was sinless. That's a terrible, but accurate, list. Let's face it. Man, without God, is in a hopeless, desperate condition.
Human nature needs changing.
The Bible, His book, tells us all about it. And, most importantly, the world needs God's laws to be known, understood and obeyed. God has promised to achieve all of these ideals, through Jesus Christ and his faithful, immortal helpers. This is God's plan. Yes, Jesus is coming to be the King of the Jews.