I watched a couple of the videos posted early in this thread. I've always been aware of Richard Dawkins, but have not read his books (sadly, I just don't read much these days).
I've always been atheist. My father is, and my mother is agnostic I suppose. Growing up without any religious dogma in the house only served to clarify the daft nature of organised religion. That said, my wife grew up in quite a religious house, and remembers a moment aged about 12 sitting in church where she decided that it was a nice story, but she just didn't buy it!
There is evidence to suggest that humans are evolved to be religious (I would love to argue that with an American Christian Fundamentalist!). In tougher times, religion was a unifying factor, offering social cohesion and cooperation that was otherwise lacking. Consequently, religious groups were more likely to survive than non religious groups. Even today, atheists have a slightly shorter predicted lifespan (I'd argue quality of life though....).
In later times, religion was used as a fantastically effective method of control of the masses. The church and the autocracies were always inextricably linked, and the promise of eternal paradise for a life of servitude worked wonderfully for centuries to subjugate the proles. It did of course help that your common man couldn't read, and even if he did, the first English bible didn't appear until the time of Henry the 8th.
I've always found so many people's need to believe in something greater than life itself to be very interesting. I've always taken things at face value, am quite rational and logical (I'd like to think) and very unsuperstitious. With that mindset, the whole notion of a God creator doesn't, and cannot fit. Whilst the scientific theories that seek to explain our existence are theories, at least they attempt to bolster their position with evidence, as opposed to the simple requisite of faith. As our understanding of the physical world increases, I dearly hope that religion, and all the awful crimes that are commited in it's name, disappear. I am however a realist, and don't believe that this will ever happen.