I'm sure people have noticed a common theme here:
(1) The skeptic asks
'but why isn't there evidence in favour of the existence of this supernatural being?'
(2) The believer replies
'because it is in the nature of the supernatural being to obfuscate and make it so that their existence is never certain' (e.g. trickery on the part of satan, or faith-generation on the part of god)
I seem to remember Daniel Dennett pointing out that this is similar to the structure of the
conspiracy theory, which often proves quite resilient because any attempt to deny the conspiracy is simply
part of the conspiracy. These cultural
memes are thus actively resistant to refutation, which is perhaps a large part of why they can be considered to fly in the face of scientific method. No wonder they persist.