Oh I see argumentum ad ridiculum. Makes a change from Leprechauns though.
Evasion again. Actually a
reductio ad absurdum is a valid form of argument in which one takes a proposition (or its negation, depending on what you're trying to prove) and demonstrate that it leads to an absurd conclusion (you can even use it, in a formal way, in mathematics).
If there is no methodology for the supernatural, then all claims about it carry equal weight, so my Erics, and, for that matter, supernatural leprechauns, are just as (in)valid as any god(s) claims. That is absurd, so there needs to be a methodology if we are to take claims about it seriously.