Evidentialism is the doctrine that demands everything one believes must be adequately grounded upon evidence. If no evidence, then belief is irrational. Whenever we come across such sweeping, grandiose assertions, we find ourselves driven to ask, "By what evidence does that assertion hold true?" Pray, what is the evidence for evidentialism? Eerrrr. Ummmm. More time, please.
David Berlinski is on to it when he writes:
It is wrong, the nineteenth-century British mathematician W.K. Clifford affirmed, "always, everywhere, and for anyone, to believe anything upon insufficient evidence." I am guessing that Clifford believed what he wrote, but what evidence he had for his belief, he did not say. [David Berlinski, The Devil's Delusion: Atheism and Its Scientific Pretensions. (New York: Basic Books, 2009), p. 47.]Fast forward to the Great Collider in Europe. Naturally, this Collider is most famous because it is the biggest. Twenty-seven kilometers of underground tunnel to house the great beast--all in an effort to research the tiniest particles in matter. The biggest to find the smallest. Looking for evidence. So that the evidentialist can believe. But what constitutes evidence? Instantly, the "picture" becomes exponentially more complex, and less evidential, we may say.