For instance: Flew (crediting a 1949 paper by C. D. Broad) calls attention to the "basic limiting principles" [which he abbreviated BLPs: I detest abbreviations, so will write it out instead]. These are more "familiar and more fundamental than any of the named laws of physics." An example (mine, not Flew's): an object, dropped from rest, falls toward the earth, not away from it. This is a matter of everyday experience, and one need not know General Relativity, or even Newton's inverse square law, to appreciate it. But here's Flew himself:
Suppose, for instance, that there has been yet another security leak in Washington.... Then everyone, or almost everyone, assumes that some hostile agent has had some form of direct or indirect sensory access to the top-secret material that is now secret no longer. It never seriously enters most people's heads that that material might have been telepathically or clairvoyantly read by an agent who at no time came within normal sensory range. That information can be acquired without the employment of the normal senses is thus precluded by a basic limiting principle.
Suppose, again, that there had actually been an explosion in the nuclear power station at Three Mile Island. No one, or almost no one, would have suggested that this might have been a case of sabotage by psychokinesis.
Atheists (Flew notes) are often accused of naturalistic dogmatism. According to these critics, atheists choose a starting point that rules out the supernatural. Theists, being more open-minded, allow the possibility of supernatural explanation. But Flew responds:
Yet it is simply grotesque to complain, in the absence of any such decisive falsifying evidence, that these appeals to the basic limiting principles and the named laws of established physics are exercises in a priori dogmatism. For what "a priori" means is prior to and independent of experience. But in both these kinds of cases [i.e., the insider leak and the nuclear explosion quoted above] we have an enormous mass of experience supporting our present beliefs and our present incredulities.
If your car won't start, who do you take it to? The mechanic, on the assumption that there is a mechanical or electrical problem, or the priest, on the assumption that it is infested with demons and needs exorcism? Our actions prove that we - theists and atheists alike - make the naturalistic assumption all the time. It is an assumption based, not on dogma, but on a wealth of collective experience: the basic limiting principles.