What I was meaning was:
If you had an effect that was considered supernatural,
and discovered an underlying mechanism that was measurable
etc. but did not fit with any current theory of the way
things work -- would it automatically become 'natural'
(i.e. drop the 'super')?
I agree, that from a creationist PoV it's just a not so subtle
way of side-stepping problems with the YEC myth (or ID myth
for that matter).
Of your choices I'd say that (2) would only indicate bias if
there were poeple actively avoiding investigating supposed
supernatural 'observations'. That's not the case otherwise
you wouldn't have the term 'paranormal investigator'.
There are undoubtedly some nuts about, but there are reasonable
people who look at supposedly supernatural/paranormal things
critically ... if there's something behind it it will eventually
be found.
(1) would mean it cannot be found, so it's meaningless in any
context apart from that of religous faith.