""He had a whole book and book tour where he called belief in God a delusion. He has spent a lot of time arguing the point. What would it take to make you "sure?"""

In other words, he expressed his opinion, and gave a (possibly over long) rationale to explain the logical process by which he arrived at that opinion.

If he is open to castigation and ridicule for doing exactly what we are doing right now (some us with rather more logic than others), we might as well pack it in.

Don T.