You have to provide evidence for whichever of the myth theories you're speaking of.
Why does anyone have to provide evidence for any particular myth theory?
Afaik nobody here in any of these threads has proposed or endorsed any particular myth theory. Even
dejudge, who I think you regard as the most extreme "mythicist" here, has in fact only ever said that the biblical figure of Jesus must be a myth (he is not talking about any so-called "HJ").
If commercial authors such as Earl Doherty or Richard Carrier propose specific myth theories (which Doherty certainly has), then of course they must provide a credible argument in support of their theory. And indeed that argument is precisely what Doherty sets out in his book (ditto Carrier in his books).
But all that has happened in HJ threads here is that sceptics such as myself have merely pointed out why the claimed evidence of Jesus is nowhere near good enough. In fact, most of us don't seem to think it's really evidence of Jesus at all ... it's evidence of peoples various 1st century religious messiah beliefs, but nowhere does it actually contain any evidence at all of anyone knowing Jesus such that they could provide known evidence of him.
As
Proudfootz just explained in an earlier post - you cannot actually have evidence of someone that does not even exist … if Jesus did not really exist, then we cannot have evidence of that non-existent being.
You can of course ask for evidence to show that the biblical stories of Jesus were “mythical”, i.e. untrue. And indeed there is a vast mountain of undeniable evidence to show precisely that.
The evidence is that the biblical writing about Jesus, whilst at one time (until relatively quite recently in fact) was universally thought to be absolutely true, is now known as a matter of scientific “fact” to be certainly untrue. That is the actual “evidence” here; evidence showing the stories of Jesus were untrue.
Also of course, there is a similar mountain of quite undeniable evidence to show how and why untrue theist accounts like the biblical stories have always been produced in all religions, inc. old testament Judaism with it’s very detailed stories of figures and events such as Kind David, Abraham, Solomon, Moses, the exile into Babylon etc., all of which are afaik now widely regarded by biblical scholars as probably just mythical fiction.
Even Yahweh himself is also of course an invention (circa 12th century BC) with a vastly detailed story of what he did and where he lives etc.
So there is vast and undeniable evidence to show how religious stories, often highly detailed, are almost always complete fiction, how ancient OT Judaism is filled with such detailed fiction, and how the NT stories of Jesus are quite certainly also fiction.
The evidence which is missing, is evidence of anyone actually ever being able to confirm that that they, or anyone else, had ever known a real Jesus. That’s what is missing.