God is certainly angry in this passage, but what God is angry about is absolutely essential for understanding both what makes God angry and God’s essential nature. If God loves as much as we believe he does, then it makes sense that God would get angry when the object of his love is hurt, neglected, oppressed or abused. But it is critical that we understand that the beginning and ending point of God’s anger is God’s love. God’s love spurs God’s anger only to bring about a more loving world.
Do yourself a favour and read the whole post: An Angry God Vs. A God Who Gets Angry | The American Jesus.