God is not a monster!  But God does not change the course of history for humans [and Jesus, with two natures, WAS human].  Jesus did not have to die to bring about his mission.  Just being born, and living among us, Jesus was effecting salvation.  You don't seem to understand what being HUMAN means.  Jesus valued people's expression of and living in faith.  He stated it many times, " Oh, you of little faith," "Woman, great is your faith." Jesus had to place HIS faith in God.  AS A HUMAN BEING, Jesus did not know that he was going to die as he did.  He certainly became much more aware of it, and especially visualized it all in the Agony in the Garden.  He also placed his life and death in the hands of the Father.

God is not always angry at humans.  We've had too much theology implying or stating it in other words.  God does not demand blood and gore---not from Jesus nor from us.  Because of his faith, his love for God & for others, Jesus showed us the great love God has for us.