What are the chief characteristics of those who practice this "practical atheism"? There are five of them, according to David's treatment.
1. Arrogance (vv. 2-4). The characteristics of the practical atheist are overlapped in David's description, but if we take them in the order they first appear, the first notable mark is arrogance.

A number of years ago Dr. George Gallup, president of the American Institute of Public Opinion, wrote a report of his research into the religious beliefs of Americans entitled "Is America's Faith for Real?" He was struck by a strange anomaly. On the one hand, the answers to his questions indicated that America is unusually religious. But on the other hand, the same research showed that America's religious beliefs make little difference in how people actually live and act.

The second part of Psalm 9 is a prayer for future deliverance based on the praise of God for past deliverances recounted in part one (vv. 13-20). This section begins and ends with prayer, just as the first part began and ended with praise. There are two petitions.

Yesterday we looked at the first thing for which David praises the Lord in this psalm.  Today we consider the other two.
2. The working out of justice and right judgment on earth (vv. 7, 8). As the chief executive officer and judge of Israel, David was responsible for seeing that justice was done in civil matters. Therefore, it is appropriate that he should praise God for having established the divine throne for judgment and for ruling justly.
The tone of Psalm 9 is set by the first two verses, which declare David's intention of praising God verbally, with words and in song, and with his whole heart. This exuberant note of praise begins and ends the psalm's first section (vv. 1-12). Right here we need to stop and apply David's example to ourselves, for it is often the case that we do neither of these things.