I often get accused of holding an anti-supernatural bias, a pre-formed assumption that God does not exist. Because of this bias, I am told, I automatically close myself off to the wonder and beauty of the Bible or I blind myself to the self-evident signs in the world that ineluctably point toward "The Creator." If I were to be more open-minded, I would be amazed at how God's wisdom permeates everything that is, was, and ever will be.
I have indeed reached the conclusion that God does not exist, that no gods do or ever have existed. That conclusion came at the "end" of many years of thinking about the matter and going back and forth on it. I place end in scare quotes because it's entirely possible my view will continue to evolve over the course of my life. Since I'm parsing words I might also think more about conclusion: in some sense it was less a conclusion and more like admitting to myself that atheism was what I thought was true. Atheism did, and does, appear to me much more likely than the claims of religions about gods and miracles.
Having arrived at atheism, I now proceed in that frame of mind. I have an anti-supernatural bias insofar as I consider the matter settled. Someone once asked me what would change my mind. My answer: If my grandfather, who died in 1983, were suddenly to appear before me and my family to have a chat, then I would seriously re-think my views. If someone were to make a very specific prophecy - like, "a swarm of bees will descend upon the city and plunge it into darkness for three days" - and it came true in just this way, then I'd be very impressed. Such events nothwithstanding, I no longer find it useful or necessary to keep asking, "but what IF God exists and everything/something said in one or more holy books is true?"
My sense of being godless is that reality is far more beautiful, complex, expansive, and strange than any religion or belief can contain. The universe and its study far outshine the dessicate doctrines of the bible and its commentaries. I would much rather experience the world, know more about the universe, and learn about how humans struggle to apply ever-greater learning to ever-greater problems - problems which are usually of our own making, unfortunately. Religion to me seems limiting in the most unhealthy way: read only the holy texts, praise god/jesus/allah/ganesh, give money to the religious instituion. Lather, rinse, repeat. Trust in the lord and don't look too long at the stuff in religion that's troubling, inconsistent, or offensive.
So let me answer one more question I am often asked. What if God in fact exists? And what if it's the God of the Hebrew Scriptures that is God? Well, if it's true and if he's actually there, this is my answer:
God has no right whatsoever to obligate me - or my descendants or my ancestors or my countrymen or my fellow life forms - to behave or think in any way. God has no right to punish or reward me for what I think and what I feel. To God I owe nothing material, emotional, or intellectual. God may not infringe upon my personal liberties and I refuse to grant it permission to do so. If God and I are to be friends - and why not? - then these are some of the ground rules going in. All this applies to everyone: God has no rights on any of us.
But let's not lose ourselves in fantasy. There's every reason to think our universe and everything in it, including us, developed through natural means and without need of, or intervention by, anything that would fit mainstream definitions of "supernatural" (e.g. gods, demiurges, angels, fairies, and so on). There's no reason to think we have any knowledge of an inscrutable, onmipotent, omniscient, living, personal god.
Without such knowledge, it seems foolish to me for people to give their emotions, money, and intellect in worship of this god. Such people worship only themselves. Ironically, this is what they claim atheists do.
My question to my questioners is this: Why would we owe God anything, if he did exist and if he did make us? Why would all of our self-affirmed and self-asserted rights as individuals collapse before this being? I think it's well worth challenging the standard line of thinking that not only assumes God exists and made us but that also insists we owe God something (our worship, our praise, our labor) for this.