Any debate with R. Dawkins is usually an enlightening delight to watch. Unfortunately, this debate becomes annoying at moments due to an intrusive moderator, who seems incapable of conducting a continuous discussion thread.
Nevertheless, I would like to highlight the sensible and elegant statements and responses given by R. Williams. It struck me that he repeatedly provided scientific responses to explicitly religious questions. For instance, in the minute 40:00, he is asked whether he thinks in a "divine intervention" to have happened during the course of human evolution. He responds to this question by saying that he believes in humans "becoming conscious of God", which is to me something most secular people would also agree to. In view of his answers, he seemed to me more agnostic than the moderator claimed himself to be!
In any case, please judge for yourselves after watching this highly recommended debate:
