The author of Psalm 12 describes a scenario that should resonate with contemporary evangelicals:

A once God-fearing society, previously built upon the moral absolutes of God’s law, is eroding from within. In its place, a culture built on pagan beliefs and secular humanism has become the prevailing worldview, with godly individuals finding themselves in the minority (Lawson, 2003).

Contrasting the profane words of arrogant sinners who considered themselves accountable to no one (Ps. 12:4) and Satan who cunningly laces truth with error (2 Cor. 11:3), the Psalmist declares,

The words of the LORD are pure words, like silver refined in a furnace on the ground, purified seven times. (Psalm 12:6)

Reassured by the purity of God’s promises established in the purity of His person, Lawson describes how the godly should live in a godless society, amid moral erosion where the righteous remnant is diminishing, society is disintegrating, truth is crumbling, and sin is flourishing:

Psalm 12 makes clear that believers should not look to the majority to formulate the direction of their lives. Truth will always be in the minority. Instead, they must fix their gaze upon God, who alone is truth. The Christian must be willing to stand alone, if need be, always looking to God to show the way. God plus one always makes a majority. In looking to God, the believer must study the Scripture, knowing that when the Bible speaks, God speaks. In the midst of increasing apostasy, all Christians must be rooted and grounded in the Scripture. Only God’s Word can make us strong in the faith and enable us to live holy lives in the midst of a godless culture. We must obey God’s commands and put into practice what he requires. The Christian must live for God, walking daily in personal obedience and holiness of a godless culture. We must obey God’s commands and put into practice what he requires. The Christian must live for God, walking daily in personal obedience and holiness.

Reference:

Lawson, S. J. (2003b). Holman Old Testament commentary: Psalms 1–75 (Vol. 11; M. Anders, Ed.). Holman Reference.