Anger with God is not unbelief.
It is an aspect of faith that has reached its current limitations.
Bonnie Zahl writes about the various ways in which a relationship with God will sometimes find us in pain and wrestling with him.
Being in relationship with other Christians we need to grow together in grace and patience to bear one another through these dark seasons.
In my many years of speaking with people who are angry at God, I have never met a person who told me that what they needed was a reminder of how to think correctly about their situation. In fact, there is some evidence to suggest the opposite: studies show that if people are made to feel judged, ashamed, or guilty about feeling angry at God, they are more likely to continue feeling angry at God, to reject God, and to use alcohol and other substances to cope. In contrast, people who said they were supported when they disclosed their anger reported greater engagement in their spiritual life and more spiritual growth as a result of the difficult experience.
Read the whole article at Mockingbird.