Beyond the problem of complete acceptance, I have yet to find a definition of God that is not:
Most definitions of god involve a lot of hand-waving, to the point at which you don't actually know what you mean when you say "I believe in God."
This is the main reason I do not associate atheism with an affirmative belief in non-existence. "I do not believe bleggs exist" is not a reasonable statement unless you can reasonably define bleggs.
"Any agent with supernatural powers who is responsible for the creation of the universe and/or mankind, who is ontologically superior to mankind" seems like a fairly catch-all definition of God (as opposed to god(s), which could be somewhat different). Admittedly, there's some hand-waving in "ontologically superior," but I think this definition is pretty effective. Admittedly I know little about Eastern religion, so I may be missing something big. I'm not attached to that definition at all and would love to see a better one if someone has one.
I feel fairly comfortable describing myself as an atheist without having a catch-all definition of God. What I mean when I describe myself as an atheist is that I believe in the non-existence of God according to the (differing) definitions used by 95%+ of people who claim to believe in God. In a discussion with an individual theist, if they ask me what I mean when I say God doesn't exist, I can ask them what they believe about God and then tell them why I believe that God doesn't exist.
In the rare case of a theist who believes in a God who created the univ...
If you’re not sure:
Where I come from, if you don’t believe in God and you don’t have a proof that God doesn’t exist, you say you’re agnostic. A typical conversation in polite company would go like this:
Woman: What are your religious views?
Me: Oh, I’m an atheist. You?
Woman: Well, do you know for certain that God doesn’t exist?
Me: I’m pretty sure, that’s what I believe.
Woman: How do you know that God isn’t withholding all evidence that he exists to test your faith? How do you know that’s not the case?
Me: Well, it’s possible that everything is an illusion.
Woman (with finality): You’re agnostic.
Every community has its own set of definitions. Here on LW, you are an atheist, simply, if you don’t believe in God. You don’t have to be 100% certain – we understand that nothing is 100% certain and you believe in God’s non-existence if you believe it with the same conviction that you believe other things, such as the Earth is orbiting around the sun. For a fuller explanation, see this comment.
For the rest of us:
My favorite passage in the Bible is Exodus 4 because this is the part of the bible that made me suspect that it was written by men; men that were pretty unsophisticated in their sense of justice and reasonable deity behavior. God asks Moses to come be on His side, and Moses agrees. The next thing that happens is that God is trying to kill Moses because his son isn’t circumcised. I guess God already asked Moses to do that? They left that part out of the story. Nevertheless, God seems more peevish than rational here. Presumably, he chose Moses for a reason. So trying to kill him in the very next scene doesn’t make a lot of sense.
As someone who has had some trouble figuring out how things are thought about in atheist circles, I would like to suggest not being like God in Exodus 4 when people ask why we’re atheist even though we can’t prove there’s no God. It’s understandably annoying to repeat yourself, but they need to understand the context of atheism here. You can refer them to this comment again or "The Fallacy of Gray" or here.
And steel yourself for the inevitable argument that belief in God is a special case and deserves extra certainty. These are final steps…
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I would like this to be a reference for people coming onto the site that consider themselves agnostic. Any editing suggestions welcome.