Reasonable Faith Podcast There's a Dragon in My Garage!
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Mar 16, 2026 
Dr. William Lane Craig, philosopher and Christian apologist known for work in philosophy of religion, debates Sagan/Hitchens’ invisible dragon thought experiment. He distinguishes immaterial beings from incoherent claims. He discusses burden of proof, what counts as evidence beyond the senses, limits on dismissing claims, and contrasts contingent dragons with arguments for a necessary being.
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Invisible Dragon Fails As A Catchall For God
- Carl Sagan's invisible dragon is meant to illustrate claims that are empirically untestable and the burden of proof principle.
- William Lane Craig argues such a comparison ignores that immaterial entities (e.g., quarks, mathematical objects) can have indirect empirical or theoretical evidence.
Burden Of Proof Is Contextual Not Absolute
- The burden of proof is context-dependent and arises primarily in forensic settings like a courtroom.
- Craig emphasizes both theism and atheism are positive knowledge claims, so neither side has a privileged burden automatically.
Empiricism Alone Is Philosophically Insufficient
- Demanding only empirical (five-sense) evidence is a positivist stance Craig says has been refuted and is self-defeating.
- He points out contemporary epistemology allows non-empirical justification like theoretical inference or properly basic beliefs.