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

[Brian37]

Regarding the probability of the initial constants, the universes initial conditions, and the laws of physics, and the objection that we don't know what the probability is:

There is a concept known as Epistemic Probability (aka inductive probability). Ian Hacking wrote 

On the one side it [the conception of probability] is statistical, concerning itself with stochastic laws or chance processes. On the other side, it is epistemological , dedicated to assessing reasonable degrees of belied in propositions quite devoid of statistical background. (Hacking, I. (1975) The Emergence of Probability: A Philosophical Study of Early Ideas about Probability. Cambridge University Press. 

A good example of this is how evolutionists say the thesis of Common Ancestry is probably true. They are not talking about statistical data. They are talking about conclusion of pieces of evidence.

There is no such thing as "evolutionist", that is your made up bullshit word to slur those who know it is true. There is simply evolution and those who accept it as fact. It is not a religion, you peddle a religion, not the scientists who know it is fact. Calling someone an "evolutionist" is a stupid as calling someone a "gravityist" or "computerist". Facts are not opinions you sell like a fictional movie or favorite soap opera or favorite reality tv show for. Facts are universal regardless of personal bias.

Those who know and accept evolution as FACT don't have to rely on a sales pitch, scientific history has proven it to be FACT and is backed up by DNA.  There you go trying to claim when scientists use "Common Ancestry" making the same stupid argument people do with the word "theory". When scientists use the term "Common Ancestry" it is not the layperson meaning you want it to mean in "the first two humans", that is not what evolution claims.

There were first conditions that lead to the countless first strands of DNA when evolution began. Much like there is no first raindrop in a storm, but building conditions that lead a storm to drop multiple rain drops at the same time. There were firsts ancestors, not a first couple. Our separation in looks from our primate cousins, was not because of one sudden change from on family, but changes in countless splits of multiple groups over long periods of many families.