For a debate between Richard Dawkins and Rowan Williams on What it Means to be Human scroll to the bottom of this page:

http://www.sevenoaksphilosophy.org/religion-resources.html

For Bertrand Russell on Religion scroll to the bottom of this page:

http://www.sevenoaksphilosophy.org/religion-resources.html

Dennett, Hitchens, Harris and Dawkins debate God here (scroll down):

http://www.sevenoaksphilosophy.org/religion-resources.html