http://www.biblegateway.com/passage/?search=Job+16&version=NIV
7 Surely, God, you have worn me out;
you have devastated my entire household.
8 You have shriveled me up—and it has become a witness;
my gauntness rises up and testifies against me.
9 God assails me and tears me in his anger
and gnashes his teeth at me;
my opponent fastens on me his piercing eyes.
10 People open their mouths to jeer at me;
they strike my cheek in scorn
and unite together against me.
11 God has turned me over to the ungodly
and thrown me into the clutches of the wicked.
12 All was well with me, but he shattered me;
he seized me by the neck and crushed me.
He has made me his target;
13 his archers surround me.
Without pity, he pierces my kidneys
and spills my gall on the ground.
14 Again and again he bursts upon me;
he rushes at me like a warrior.
Job is angry with God because he assumes that everything that happens has been done by God. Notice how he is personalizing this – “God assails me”. What we see in the introduction is that God allows Satan to do the evil deeds, but does not do them Himself. What Job is missing here is the other side of the story.