Just a few years back (100, for example), there were a lot of things that humanity did not understand or even thought to be possible. Some of these things got real and common nowadays.
Since written history, humanity has often portrayed things that were not understood as the work of a higher being (be it God, Allah or whatsoever). The more we advanced, the less we thought to be supernatural but just natural facts we didn't understand at first. And so here we are, more advanced than ever (duh) and understanding more and more. Still, stuff we cannot get a grip on, we portray as the work of a higher being. My theory is that with time, we will learn more and more about the things we don't understand right now and the reasonability in believing in a God will fade away.
No I don't believe in a God. The story above is one of the many reasons why I do not believe in a God. That doesn't rule out there is something bigger we don't understand... maybe there are multiple dimensions, ascended aliens and whatever other things Hollywood made up....I see no point though in considering that as holy or such. I guess that's a personal thing though...!