A talk Jon Topping has given, outside of the podcast.
I've heard many atheists say there are no arguments for God's existence. The problem with that is that there have been arguments for God's existence for literally thousands of years. Here's a contemporary version of an ancient argument for God - the Cosmological Argument for God's Existence. This argument deals with the idea of causation, and how everything that exists came about, and shows that something like God must exist in order to explain the existence of all the universe.