Not read the thread yet but weighing in.
Op I presume when you said 'god' you meant the god of the three main monotheistic religions (a theist interpretation of god)? Some people believe in 'a god'- a higher power that goes as far as creation but doesn't involve him/herself in our lives per se, but do not believe in organised religion (deists).
I am a non believer, for the very reason many of my friends of faith believe- but just the opposite!
They use the tired old 'without the bible/torah/quran book of mormon where do we get our morals?' I believe that morals are part of our existence and play a part in our biology, nothing to do with the bible. Also, anyone who would suggest getting their morals solely from the bible is probably a psychopath.
Non believers can live happy, fulfilling, generous, caring, grateful lives. Some might even argue that we appreciate it even more because we accept that we do not survive the destruction of our brains (and therefore our consciousness).
I see religion mainly of one of two things, sometimes both simultaneously- a comfort blanket, or a way to control others.
I don't believe in god because he is too easily explained away with logic/ and there is really no test conclusive enough to prove his existence, until there is I'm willing to change my mind (as all decent non believers should be)