This episode of Unbelieveable was yet another debate over where might get one's moral ideas if not from stone tablets carved out on Mt. Sinai. Honestly, I wonder why Christians think this question is such a stumper. If you define morality to mean absolute commands which come down from above, then of course you'll need to have a god up on high giving out commands.
The atheist in this show is a layman and a bit of a try-hard, he barely gets a word in edgewise, much less a decent argument, though he is constantly being prodded by the host to do so. The Christian apologist, by contrast, rambles on and repeatedly claims that everything good and pure comes from Christianity while discounting any harms it caused along with the moral values of every other culture. Such old school cultural imperialism ought not be too shocking from a British minister and True Scotsman.
This one is not worth your time, even when played at 2x.