God is fully qualified to be our psychiatrist. That isn't the problem. I think the question is: are we qualified to hear what He says, can we understand if He told us, or do we even bother acting on what He does say when we do hear and undertand?
He knows all. The best we can do is to seek His wisdom. He gives doctors knowledge and wisdom to help us.
My pain management psychologist is a Christian, and I know he relies upon God to lead him to help me. Together they make a great team! And the 3 of us are winning the battle.