not being in the Bible didn't seem to affect the argument. His bottom line was, no matter how big the population gets, God will provide. Same thing for crude oil supplies, rain forest etc.
I mean no disrespect, but how many dumb/bad things have been attributed to that book when people can find no such reference in there.
Maybe after some reflection his viewpoint will change.

My personal view, is that God may well provide, and gives us the chance to help ourselves, not by fixing it for us. Ignoring it and continuing on blindly is not sensible.
It reminds me of the 'joke' about the priest in a flood, ignoring the boats going by offering rescue. When he drowns and goes to heaven he askes why he was drowned and God replies "but I sent you five boats".

You can only get so many hints!