The number one most common response from believers after outing myself as an atheist is...
“The fool that said in his heart, There is no God. They are corrupt, they have done abominable works, there is none that doeth good” Psalm 14:1
First off, they should know this is meaningless to an atheist. We don't believe in Psalm or any books of the Bible.
Secondly, if we did give a crap about the Bible, this very passage highlights a contradiction when Jesus said “…whosoever shall say, “Thou fool,” shall be in danger of hell fire.” Matthew 5:22. It was an opening bit of the sermon on the mount that basically made anger an equivalent sin to murder.
Speaking of Matthew, "judge not lest ye be judged."
Statistically speaking, there is no reason to believe that atheists do less good or more harm than theists.
And lastly, why not defend your beliefs with reasons why you believe rather than quote one of the oldest insults in the world? Seriously, get some new material.