My opinions on this topic are taken from lectures I’ve heard on gnosticism and insights I’ve gathered from the late Francis Schaeffer.
The supposed utopian implications of naturalism are that God can supposedly continue to be justifiably pushed out of the media, the arts, and science so long as Evolution is not openly challenged. As long as Evolution stands un-questioned, naturalism will supposedly remain justified. As long as naturalism is predominant, objective morality, beauty, truth, and meaning will go down the drain. It will be replaced with our invented morality and invented truth which will ultimately end in destruction. The unforeseen downfall to all this is that naturalism inevitably brings about humanism, autonomy, and hedonism in the worst ways. These will become, and have already become the guiding factors of our societies worldview.