The question is flawed from the start.
Everyone who is non-religious is the best living spokesman for atheism simply by not believing, in that respect.
Who's accomplished the most on behalf of it? Even that would need further specification, accomplishing something on behalf of it can be any accomplishment.
I think you're implying more along the lines of "Who is the most accomplished on the grounds of refuting the ideological claim of god, and has pointed out new flaws in theistic claims that weren't previously known"
Everyone who is non-religious is the best living spokesman for atheism simply by not believing, in that respect.
Who's accomplished the most on behalf of it? Even that would need further specification, accomplishing something on behalf of it can be any accomplishment.
I think you're implying more along the lines of "Who is the most accomplished on the grounds of refuting the ideological claim of god, and has pointed out new flaws in theistic claims that weren't previously known"
Which is better:
To die with ignorance, or to live with intelligence?
Truth doesn't accommodate to personal opinions.
The choice is yours.
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There is God and there is man, it's only a matter of who created whom
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The more questions you ask, the more you realize that disagreement is inevitable, and communication of this disagreement, irrelevant.