Atheists... why do you believe that God doesn't exist?

[Chas]

Believer: I believe in God.

Atheist: Why?

Believer: Because the fine-tuning of the universe for life is exponentially more likely on theism than on naturalism, and thus constitutes a strong probabilistic argument for theism. [This does in fact seem to be true]
No, it doesn't.
Especially since 'fine tuning' cannot be convincingly demonstrated.

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Believer: I believe in God.
Atheist: You're wrong.
Believer: Why am I wrong?
Me: Because there is no proof that your god exists.

Absence of evidence is not evidence of absence.

It is when the evidence should be there.

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But yes. Burden of proof arguments are trivial like you say. At the same time I think its disingenuous for some to rail against believers and hiding behind a facade of indifference. If they were simply nonbelievers then the appropriate position is agnosticism.

You continue to willfully ignore the definition of atheism - you are tiresome.