The point is that all scientific theories are testable and potentially falsifiable.
I'm aware that this is your assertion. I'm stating that this isn't how science works, hence my argument that an observation of some mysterious being or the discovery of a rabbit-like skeleton in the Cambrian rock strata wouldn't mean we automatically disqualify the theory of evolution.
A simultaneous hallucination seen by seven billion people would certainly get our attention, although I'm sure there would be many holdouts.
It would be noticed, but it's still an observation. Even an anomalous observation, however, wouldn't serve as an automatic falsification. This was one of the motivations that influenced Imre Lakatos (a student of Popper's) to propose his research programmes theory of scientific progress.
A task for science would then be to test the theory of a global hallucination vs. the theory of a deity. It would still be science, not religion, which does not embrace testing and potential falsification.
True, but the theory of a deity would require a working definition. The very quest you're suggesting (appearance of a deity equals the falsification of evolution) conflicts with your claim that religion differs to science because it cannot be falsified. You're trying to have your cake and eat it too, it seems.
Athon