Spend five minutes on a college campus. You won't find stupider people than those with a Ph.D. They're good at information and research in a specific field and nothing else.
Specialized knowledge does not make a genius, that's for sure.
"Let no man deceive himself: if any man among you seem to be wise in this world, let him become a fool, that he may be wise. For the wisdom of this world is foolishness with God. For it is written: I will catch the wise in their own craftiness. And again: The Lord knoweth the thoughts of the wise, that they are vain." -1 Cor. 3:18-20.