There are three Hebrew words for fool, and all speak of moral orientation rather than intellectual ability. The fool of Psalm 14 reflects someone who stubbornly rejects wisdom; the word lies behind the name Nabal. (Remember him from I Samuel 25:25?)
The phrase, there is no God, expresses not philosophical atheism but the idea that God, if he exists, takes no interest in human affairs and will not call people to account for their deeds.
Those who believe that God is distant, ineffective, powerless, will always see a corresponding moral and spiritual decline in their lives.
Could it be that this is what's wrong with our world?