By spending an hour bashing and attacking those who DO believe in God. It'll be more of the usual leftist anti-Christianity schtick. That would be my guess.
And that's why I have a hard time with these people. On the one hand, Christians are called upon to spread the gospel -- so Christians often approach people and say, "Let me share my beliefs with you. Let me tell you how wonderful Jesus has made my life."
Now, on the other hand, I suppose atheists can be evangelical too, and tell people about their beliefs. Nothing wrong with that. But can they say that atheism has made their lives wonderful? I don't think so. All they can really do is insult the foolish people believe in God.
Evangelical atheists are rude and boorish.