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

[masterofpuppets]

I'll grant God is finely tuned to create universes. You are making a category error. You want to believe there is a naturalistic explanation against all odds. I believe there is a personal (intentional design) explanation. If you stick with the naturalistic, and propose a multiverse, you are only doing so to explain away the odds but really you have just moved the same problem back one step.  BTW, you have also crossed from science and entered the realm of metaphysics--because there is nothing scientific about a multiverse.

Nope, you fail with that first sentence right off the bat. We are not going to assume a god first, that is not how good logic works.

Just like you would not assume a giant invisible pink unicorn farted the universe into existence. It would be stupid of you to simply swallow that. 

Fine tuned my ass. Humans can choke on their food because they share the same eating breathing tube, people die from choking all the time. Cockroaches are far better at reproduction than humans, outnumber humans and are far better suited to survive an extinction event like the meteor that killed the dinosaurs. 

You merely want your god claim to be true, but so what, there are other people worldwide with their fictional sky heros who try to fill in the gap too. Get in line take a number.

To add to that, I have at no point accepted the multiverse hypothesis as true. I simply don't believe in anything beyond the material universe at this point of time.