Yes, this is old but still great none-the-less. Where does the idea of a god come from? Could it be the use of fear that created a god? Or perhaps a way to control people? Or how about the way a primitive toolmaker thinks. Well Douglas Adams believes the latter, and after watching this quick little video feature about his idea, it's hard to imagine a god being created any other way. In September 1998 while in Cambridge, Douglas Adams gave a very well thought out speech about the origin of god and how primitive man came to the conclusion that this world was built for him by someone much more powerful than himself.

Give it a watch. It makes sense. And for those who don't know who Douglas Adams is here's a brief bio of him (from Wikipedia): 

Douglas Noël Adams (11 March 1952 – 11 May 2001) was an English author, comic radio dramatist, and musician. He is best known as the author of the Hitchhiker's Guide to the Galaxy series. [...] In addition to The Hitchhiker's Guide to the Galaxy, Douglas Adams wrote or co-wrote three stories of the science fiction television series Doctor Who and served as Script Editor during the seventeenth season. [...] Acclaimed biologist Richard Dawkins dedicated his book The God Delusion to Douglas Adams posthumously in which Dawkins claims Adams came to understand evolution through Dawkins' writings thereby "converting" to atheism. Douglas was a keen technologist, writing about such inventions as e-mail and Usenet before they became widely popular, or even widely known.