To illustrate to atheists the difficulty of maintaining morality in the absence of religion, I would ask them to explain to me why cannibalism was morally wrong. Reductio ad absurdum to make my point. But apparently this one came to the conclusion that there really isn’t anything wrong with it.
I suppose you’d have to ask him to explain why ignoring climate change is morally wrong. That would hit a nerve.
‘To illustrate to atheists the difficulty of maintaining morality in the absence of religion...’
read up on the ethics involved in many of humanity’s religions throughout history, and get back to me about ‘morality’...