But then the dream is doing zero work: your friend could simply say God told him the proof of the conjecture, and your situation is the same - if the proof checks out then you need to compare base rate for gods delivering math proofs and your friend secretly having a hobby of being a mathematician and succeeding etc to see whether it changes your beliefs.
And delivering a mathematical proof is surely not what >99% of God's previous statements were doing.
And delivering a mathematical proof is surely not what >99% of God's previous statements were doing.
Why is that relevant? To see the flaw in your reasoning replace "God" with "mathematician X" and notice that >99% of mathematician X's previous statements aren't delivering mathematics proofs either.
Here's the new thread for posting quotes, with the usual rules: