If that person believes in one god that makes them a theist and not an atheist. The quote says, "I contend we are both atheists..." which is completely false if someone believes in even one god. The atheist is calling a theist an atheist and that is ridiculous. And yeah I get the point, because they have sooo many other gods they don't believe in, and we are only separated from belief in one of those gods, the author "contends" they are both atheists. This is false. Words have meanings for a reason.