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

[Neo-Scholastic]

Things like a global flood or striped goats are indeed ruled out by science.  Your pointing to unlikely events actually happening is a conflation between unlikely and implausible.  

I remember hearing a preacher say, with the respect Gen 6:1, that in the bible "all means all all the time," therefore the flood covered the entire earth. You're making the same mistake. You're trying to say that the authors of the bible intended to record such things as historical accounts using modern narrating conventions. Ancient Hebrew superlatives are often used for emphasis not as statements of fact. It's like me saying "This is the best burger ever!" We know that because there are multiple examples of superlative being used in just that way in other locations. The fact of the matter, is that the bible cannot contradict the findings of modern science because it's not making any scientific claims in the first place! Likewise the story of Jacob's ewes isn't a scientific claim about genetics or even and account of animal husbandry practices in the ancient world. To read it like that is just inappropriate.