In case you missed it in your reading, Psalm 14:1-7 and Psalm 53:1-6 are basically identical. I am not sure why they are repeated in this fashion, but the points are hard to miss:
Those who reject God as the foundation for life are called fools. The English writer G. K. Chesterton wisely said, God is like the sun; you cannot look at it, but without it, you cannot look at anything else."
Without God, people descend into corruption; they engage in abominable deeds and cannot see what is good or do what is good. Psalm 53: 1
Believing or rejecting God does not change the reality of God's existence. God is self-sufficient and self-existent and does not need human validation in order to exist. God looks down from heaven and sees right into the heart of every human being. What God sees from heaven are fallen people, corrupt people; there is no one who is good. Psalm 53: 2-3
The bottom line of these two Psalms is that the unbeliever has everything to fear because every soul is accountable to God. God's people have nothing to fear because he is their salvation. See Psalm 14: 5-6; Psalm 53: 5
Precious Lord, we have no one in heaven besides you, and there is nothing on earth we desire but you. Our heat and strength may fail but you are the strength of our lives and our portion forever. Amen