One of the key underlying assumptions of science is that human sense perception is able to accurately detect the nature of reality. Where devices are used to confirm or enhance human perception (eg camera, thermometer, computer, geiger counter... and many others) then human sense perception is still required to confirm those device's results.
This underlying assumption itself cannot be tested by science because it must first be assumed before science can begin.
This leads to a couple of necessary conclusions which are very significant:
- Science is entirely based on faith. (ie faith in the underlying assumptions of science)
- To the extent that Atheism relies on science (as the only reliable source of truth) it is thus also entirely faith based.