I can't go on any longer without mentioning Richard Dawkins. He is tireless in his championing of the intellect, of reason over superstition, and thus of the redundancy of religion. His latest TV series - The Enemies of Reason - began its run here in the UK last night. http://www.channel4.com/culture/microsites/E/enemies_of_reason/index.html
It is well worth a look, if you can cope with the feelings of depression it will promote in any person who thinks for themselves. It is scary to see the gusto with which people throw off centuries of hard-won knowledge and run back to the cave of superstition. He did an interview with Richard & Judy, which you can see here: http://video.google.com/videoplay?docid=-1964171996506271039&hl=en
It's an interesting interview, because Judy clearly so desperately wants to believe in astrology et al that she seems to be in almost physical discomfort at the thought that there might be no truth in them. It was a clear demonstration of how deep the desire for this kind of comfort goes in an individual and how reluctant they are to give up the fantasy, even when they can see the strings, as when Derren Brown did the "psychic" reading. We seem to be as far away as ever from becoming a race of rational beings, free from medieval superstitions.
You can find his main site here: http://richarddawkins.net/