The writer of Ecclesiastes comes out of the struggle of opposing worldviews as a believer. In the final analysis there is nothing in Ecclesiastes that teaches contrary to the immortality of the soul, of eternity, of God’s goodness, and of certain accountability in a final judgment. In the end he comes out with a Christian Worldview!
I believe the most debilitating defect in the Body of Christ today is the lack of understanding and application of God’s Law. The larger portion of Evangelical Christians are antinomian (which means “against law”).