
The Christian Bible also warned against false prophets -
Matthew 24:24 - "For false messiahs and false prophets will appear and perform great signs and wonders to deceive, if possible, even the elect".
I doubt politicians, church leaders, celebrities, 'experts', CEO's, journalists, opinionated billionaires, the commentariat, ethicists, sporting 'heroes'...all of them. Anyone who's trying to persuade me to agree with their point of view automatically has me thinking "Why do they want that? What benefit does my agreement or compliance bring them?"
More often than not it's to do with money, and many are blunt about that (advertisers, for example...they're crass but fundamentally honest in their wish to sell you things which you're not obliged to spend money on). Politicians want votes, commentators want an audience, etc, and they all use one another to get what they want (Trump needs the media as much as the media needs Trump). It's the ones who want to 'sell' me an idea or belief system whose intentions I doubt the most.
When people's motives are more esoteric, I become deeply suspicious. Just my opinion, of course.
I haven't seen a Yowie or a ghost. I don't know if they exist. I know for sure, though, that there are con-artists and liars in the world.
I agree with Black that a literal interpretation of the Bible (or any ancient text) isn't really applicable to the study of cryptids. Assuming that one word from thousands of years ago relates directly to something we'd like it to refer to right now just isn't reasonable.
Scholars disagree about what the word Nephilim directly translates as -
https://en.wikipedia.org/wiki/Nephilim
Even if it does mean 'giants', it doesn't mean that they were obliquely referring to Yowies. Just my opinion, of course.