I have a great secular proof for the existence of Hell, David - no Bible required - just some sophomore level logic, maybe a little higher level:

1. Every natural innate human desire has a corresponding satisfying object in reality. (e.g., thirst has the object of water, hunger has the object of food, love has the object of persons and dogs, knowledge has the object of reality perceived through our five senses plus the enormous complexity-resolving hardware and software of our brain, etc) (observation and human experience)

2. Humans possess a natural innate desire for objective moral justice to be satisfied. (the existence of laws, police forces, and prison; also, human psychology; in fact, this desire is so strong that even many atheists will utter the phrase “Go to Hell”)

3. Therefore, objective moral justice exists. (1,2 Modus Ponens)

4. If objective moral justice exists, then it exists for everyone – otherwise, it would not be objective, moral, or justice. (definition of objective moral justice)

5. Therefore, objective moral justice exists for everyone. (4,3 Modus Ponens)

6. If objective moral justice exists for everyone, then it must exist in this life or a potential afterlife for everyone. (complete disjunction on potential human existence)

7. Therefore, objective moral justice must exist in this life or an afterlife for everyone. (6,5 Modus Ponens)

8. For some persons, objective moral justice is not satisfied in this lifetime. (e.g., Hitler, Stalin, Mao, unrepentant abortion "doctors," abortuary deathscorts, etc) (observation regarding heinous atrocities whose perpetrators never received OMJ in this life)

9. Therefore, for some persons, objective moral justice is satisfied in an afterlife. (7,8 simple cancellation)

10. Therefore, objective moral justice exists in an afterlife, i.e., Hell exists. (existential generalization)

(Special thanks to the following atheist-agnostics, and others unnamed, who provided constructive criticisms helping me to identify hidden steps: Elie, markb, Unrepentant Atheist, and Disqusdmnj. Any remaining errors are mine and mine alone.)