Here is a neat article written by Ricky Gervais about becoming an Atheist. I like Ricky Gervais, his comedy shows The Office and Extras are very funny but I think the best insight into who he is, his comedy and his beliefs comes from listening to his podcast\radio shows.
Hearing Ricky try to explain to friend Karl Pilkington the theories about life is a comedy sketch in itself. Just the other day I was listening to one his podcasts and Karl truly believed that a stick insect had 'shagged' a stick in order for it to take on the characteristics rather than evolve.
Not many celebrities have actually come out and said they are atheists, its a bit of a taboo thing to do. I think it is great, and more celebs should follow his lead. Ricky Gervais and Steve Merchant (his collaborator) are both advocates for the scientific and have both mentioned their disbelief in such hocus pocus as Magic, Ghosts, Religion and other non scientifically proven theories. Hopefully they will continue to explain it to Karl the Layman thus entertaining the masses for a while longer.
If you get a chance then do listen to the podcasts, they are available on itunes and other media.