This chart is based on Phil Johnson's lecture on the basics of Post-Modernism. I will be referring back to this chart frequently.
If you understand what this chart shows us then you'll understand exactly why both Modernism and Post-Modernism are incompatible with Biblical Christianity.
Note: Even though Biblical Christianity is a 'form of' Pre-Modernism it needed to be view as separate and distinct from pre-modernity.
Click on the chart to view it full size.