Theists: What is the most compelling argument you have heard for Atheism?

[Mister Agenda]

I don't think is a matter of lowering the bar. I think if most people are pre-disposed to think that the supernatural exists, then the Christian version is the best evidenced religion by far. This assessment is supported by the fact that Christianity grows by many millions of adult conversions across the world each year whereas other religions do not.

Predisposal to think something isn't evidence of that something, but it's a pretty good reason to be suspicious of any claim that people are pre-disposed to accept on insufficient evidence.

So, if Islam had more adult conversions, you would switch, because that's such a good reason to think a religion is correct? If not, what does the rate of adult conversion have to do with the price of tea in China?

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But how else can we ever judge a claim except by the conceptions we've acquired up to that point?  For a claim that by definition for a miracle is impossible by all prior understandings, it is very hard to say in advance what the standard should be.  All I'm sure of is that connecting the dots for the natural aspects of the claim will in no way bridge the way to vouchsafing the part which is alleged to be 'miraculous'.

Human beings are not born naturalists; but rather, are instinctively aware of and attuned to the ineffable, sublime, and uncanny. My challenge is to your assumption that  "a miracle is impossible by all prior understandings." I submit to you that exclusion of the miraculous is the result of cultivating a mindset against it.

That is true. The mindset of which you're thinking is reasonable skepticism.