Most atheists aren't making any claims, and there really is no empirical evidence for God.Most Thiests stake their entire life upon the so called evidence of another person that lived thousands of years ago that cannot be proved using commonly accepted terms, but the Athiest does the same thing buy simply denying any proof ever existed. Neither one has a single ounce of substance to support their claim! An Athiest is like those who said it's impossible to reach the speed of sound because a horse cannot gallop fast enough.... how stupid is that! An optimist exceeded the speed of sound!
Atheists are just withholding belief pending convincing evidence, just as I assume you would do with a claim of six legged geese in the wilds of Southeast Asia.