Why Argue with an Atheist?

I’ve been watching a debate (from 2008) between Christopher Hitchens (an atheist), Dinesh D’Souza (a Christian), and Dennis Prager (a Jew).  (See the video here: https://m.youtube.com/watch?v=0LY6Vwcp4-U).  The debate lasts for about two hours, and I’m 45 minutes into it. So far, Hitchens has dwelled a lot on evils committed by religious people.  I was surprised to…