My rule is that if you are not the physicist or the scientist that carried out the experiments and reached those conclusions yourself, then you are a believer only. ...
Harsh rule...
Let's take the invention of the transistor as an example. It was, of course, loosely based on the galena crystal detector which had conduction properties which, in the 1920's, 30's and 40's, no one really understood. Yet its use was wide spread and the
belief in its rectifying properties were accepted and believed to be true despite a total lack of any scientifically derived explanations for
why it did what it did.
With the invention of the germanium based transistor (Bell Labs), the properties exhibited by the device were finally investigated and defined, obviously
after the belief in the efficacy of the device was established.
Seems to me that if I can review and
understand the steps and methods that the physicists (or scientists) took to arrive at their ultimately successful creation of the transistor , then I have, in effect, reproduced the experiment(s) and have an equally valid right to
believe in the resultant device(s), without ant further qualification.
I might even go so far as to postulate that even if I didn't investigate their work or, for that matter didn't even understand it, that my belief in the reality of its capabilities is any less significant.
Same goes for God...