I'm obviously not going to get you to justify yourself as to your positive assertion that God is an imaginary friend and that he does not exist.
I've already justified my stance; if you don't like the justification, by all means offer up an argument, but to just tell me that the ball is in my court to do more to falsify your claim which you've not offered sufficient evidence for isn't going to wash.
Where do you think the arguments fall down?
It really rather depends on the argument; different attempts fail at different stages. The 'Irreducible Complexity' claims have different logical flaws to the Cosmological Argument(s), which again differ from the 'but millions of people believe' nonsense.
I think that only works if you adopt a framework for evidence that is merely a restatement of empiricism, scientism, materialism and/or naturalism.
If you've got a better framework, by all means put it forward. Empricism isn't perfect, but it's currently reliable so long as you don't attempt to step outside its bounds.
Is skepticism skeptical about itself? I'd love to hear the success criteria by which you judged it.
It should be, if it's done well. Empiricists need to remember that any conclusions drawn are always, at least technically, provisional. Other forms of skepticism should be mindful that they are, similarly, only holding to positions until something calls them into question.
So, again, if you've got another framework than empiricism to derive an argument from natural phenomena, then by all means proffer it and I'll review in light of the new information; if you've got a new logical derivation bring it forward and I'll try to look at with an open mind.
O.