.... Because I'm curious :)
It has been my experience that most atheists I have either met or heard of have been intent on trying to prove that God does not exist. So my question is, why so intent on that goal? I mean, if something is not real, why spend your entire life trying to disprove it publicly? Why not just be like "okay, well I know such and such is not real, so that's it."? I mean, I know that the lockness monster, Bigfoot, and aliens aren't real, but I do not make it my life's entire purpose to prove that I am right; it would be a waste of my time.
And I hope this doesn't offend anyone, I am just genuinely curious. Usually people only publicly fight over real, legitimate, issues and it seems to me that if God is not real, then arguing that He isn't is a moot point and the biggest waste of someone's life ever.