It's easy to read the book of Job and leave confused. Why does God allow Job to suffer so much? How can Job claim to be sinless? Who are these "friends" who seem so bent on attacking Job?
God is angry at these friends because they are not speaking right about Him (Job 42:7). Their wisdom is empty.
Too often, we try to make sense out of our lives with our own wisdom. By applying what we know. The book of Job teaches a different lesson: true wisdom comes only from God.