Well, given that it’s been the theists for most of human history, I’d venture it’s them. Hence, delusion is extremely normal, so much so I wonder, quite honestly, I don’t experience it they way they do.
This is so wrong on so many levels it’s hard to know where to start. Maybe an example will help the most:
Einstein’s theory of General Relativity has been tested to the limits of our technological capability, and never has anyone been able to demonstrate that what we have observed deviates from predictions based on the theory, recently to an accuracy of better than around 50 parts-per-million. Pretty good, right?
Yet, physicists have gotten millions of dollars in funding to launch Gravity Probe B, an instrument designed to detect gravitomagnetism, in this context manifested as a phenomenon called frame dragging. Gen. Rel. predicts such weird effects, but it’s been fiendishly difficult to observe, because gravity is so weak, and the effects so small. But why should be bother expending the time and money, to launch one of the most sensitive detectors ever designed, to test a theory that, in every other test, has passed with such flying colors no one seriously doubts its accuracy?
Because you can never be sure.
Faith is the antithesis of science. General Relativity has provided us with, IMO, mind-blowing insight into the workings of the cosmos, and suggests realms of existence I must struggle with all my mind just to get the slightest grip on. It is probably the first or second-most important and far-reaching theoretical framework the human mind has ever conceived of. It has been shown in every assay tried to be without predictive flaw, and yet we’re still testing it. You do not need faith, nor ought you to have it, when investigating the world using the scientific method. You demand evidence, you build theoretical frameworks around that evidence, and you test those theories ceaslessly to see if the principles they contain can be violated. That is precisely how scientists go about thier business every day, and they actually often quite look forward (though not without trauma, at times) to the moments when old theories are overturned and modified due to new experimental insights. It is a constant pursuit of something that may be wrong with what we think we know, and typically the moment a scientist has faith in their theories, the moment they start to fail. It happens all the time, even to the greatest, because they’re human. But the discipline moves forward with or without them, never trusting what came before enough to abandon testing the fronteirs of what we think we know.