The falsifiability challenge

In Episode 37, we posed the following challenge:

Under what conditions could you be convinced that what you believe is false?

We send this challenge to anyone: scientist, theist, conspiracy theorist, homeopath, or anyone else who holds any unproven belief to be true. Note that we're not necessarily asking for realistic conditions. We submit that the easier it is to think of conditions that would falsify a claim, the stronger that claim is. Send us your falsification criteria, and we'll list them here.

ClaimMay be falsified by...submitted by
Life evolved over billions of yearsRabbit fossils in the precambrianJ.B.S. Haldane
God answers prayersFailed prayer studiesHarvard & the Templeton Foundation
God gives us free willA "belief in god" geneFathima