DEATH

For those wishing to rid the world of poverty, war, famine... and religion, eliminate "death" as a problem. The fear of biological death and it's threat to human meaning, value, and purpose (personified as "Death" in the Bible) and our human, dysfunctional, response to Death ("Sin" in the New Testament) is the root of all religion and is part and parcel of the human condition whether religious or secular.

See Why contemplating death changes how you think (BBC)