There is no such thing as an 'atheist life' It's like saying there is an 'I don't believe in Santa' life. I realize that some people treat atheism as a religion, but it is not, and those folks are misguided. Atheism is an ABSENCE of belief. Christians are all atheists as well, I just believe in one fewer God than they do.
Atheism is not always "the absence of belief."
Many atheists (perhaps ALL atheists) BELIEVE that there are no gods...or BELIEVE it is more likely that there are no gods than that there is at least one.