A couple of points in agreement with you: First, Death is the natural consequence of sin, as Romans 3:23 points out, Second, the ingrained nature of sin is not only described in Scripture: Psalms 51, Romans 7, but also acknowledged by those who study human behavior and admit to some behaviors being at least to some degree genetic: https://geneticeducation.co.in/8-examples-that-prove-behavior-is-genetic/