As reported in The Telegraph, Radcliffe not only identified himself as an ATHEIST in this interview but expressed his respect for Richard Dawkins.
http://www.telegraph.co.uk/culture/harry-potter/5734000/Daniel-Radcliffe-a-cool-nerd.html
Another addition to the the long list of international celebrity atheist, alongside Jodie Foster, Jack Nicholson, Angelina Jolie, and many more.
check out:
http://www.celebatheists.com/?title=Main_Page