I normally minded my own business, but I couldn't help myself - I literally burst out laughing! I asked him, "What, are you crazy? The communists butchered 100 million people this century, and they're atheists! And the century ain't over yet!"
The conversation shifted to different subjects after that...
;>)
Just goes to show you that people that are in STEM related careers may be smart in their particular field, but they're not smart about everything. I worked with actual rocket scientists for years, and I could tell you some stories...