The New Statesman recently asked a number of prominent atheists and agnostics why they don’t believe in God. Their responses were mostly pretty good. Some favorites (and skipping the most famous):
Invoking God at best highlights what we cannot yet explain about the physical universe, and at worst exploits that ignorance to mystify. Moral values do not come prepackaged from God, but have to be worked out by human beings through a combination of empathy, reasoning and dialogue.
This is true of believers, too: they, after all, have to decide for themselves which values in their holy books they accept and which ones they reject.
And it is not God that gives meaning to our lives, but our relationships with fellow human beings and the goals and obligations that derive from them. God is at best redundant, at worst an obstruction. Why do I need him?
It is often said that religious faith is about mankind’s search for a deeper meaning to existence. But just because we search for it does not mean it is there. My faith is in humanity itself, without attaching any metaphysical baggage.
I think probably the main answer to your question is: I just don’t have any interest either way, but I wouldn’t want to understate how uninterested I am. There still hasn’t been a word invented for people like me, whose main experience when presented with this issue is an overwhelming, mind-blowing, intergalactic sense of having more interesting things to think about. I’m not sure that’s accurately covered by words such as “atheist”, and definitely not by “agnostic”. I just don’t care.