I have a high regard for both Groothuis and Moreland. Moreland has moved into supplementing his apologetics with a complementary emphasis on the devotional life and third wave charismatic spirituality, thus his new book Kingdom Triangle: Recover the Christian Mind, Renovate the Soul, Restore the Spirit's Power . Groothuis in his book review summarizes the deficiencies of naturalism and postmodernism, saying;
In explaining the contemporary crisis, Moreland writes that we have moved from the “thick” world of the biblical worldview to the “thin” worlds of naturalism and postmodernism. A biblical worldview provides the knowledge of God, existential meaning, and authentic drama to all of life. We are creatures of a good and holy God, placed on earth to manifest the virtues of the Kingdom of God. We are immersed in and engaged with a life and death struggle with the forces of evil, yet God is our strength and hope. We are not groping in the dark, but have been given knowable truth in Scripture and elsewhere.
But both scientific naturalism and postmodernism—each in its own way—eviscerate the world of any objective meaning or genuine drama. Naturalism denies the reality of anything outside of what materialistic science can observe. The cosmos is reduced
to merely material properties. All must be explained by impersonal change and necessity. There is no soul, no God, no angels or demons, and no afterlife. As Peter Berger put it, it is “a world without windows” because the universe is self-enclosed. Morality is not rooted in the Designer and in human nature, but is merely the result of natural selection. Knowledge is limited to what can be known through scientific methods (scientism).
Postmodernism recoils from the aridity of scientific naturalism and tries to find meaning in the meaning-creation of communities and individuals. Like scientific naturalism, it denies that there is any objective meaning to life, but instead of trying to find meaning in science, it affirms the contingent constructions of human beings, variously situated. Each community—or person—has its own narrative or language game, none of which is superior to any other, but all of which are acceptable. However, there is no objective meaning to be found and no knowledge of objective reality to be had. While scientific naturalism is a form of realism (we can know something of objective reality, which is only material), postmodernism is a form of nonrealism
These two worldviews rob us of objective moral values, the dignity of human beings, and any concrete hope for our existence. As a result, instead of moral agents deeply rooted in objective reality, we find around us—or even within us—“empty selves” that are restless, easily distracted, infantile, and narcissistic. Moreland ardently argues that both worldviews are both empty and false. Christianity not only provides meaning and drama for life, but is true and rational and knowable. The knowledge of God is available to errant humans. While the book does not give a full-fledged apologetic for Christianity or against scientific naturalism and postmodernism, it does powerfully demonstrate the intellectual weaknesses of these two worldviews with respect to epistemology, metaphysics, and ethics. (there is no objective reality, scientific or otherwise, to know). Both deny the knowledge of God.