Ok! I'm new here but whatever... thought I'd reply to Insight anyway, even though his post is like ages old.
First of all, Rene Descartes said "I think therefore I am", not Shakespeare.
Now, as for your question about why atheists abide by a code of moral conduct - just because I am an atheist does not mean I have no ethics. I have my own idea of what is right and wrong, not because I'm worried about getting into heaven or anything, but because I've established by my own set of rules. And, yes, they are probably similar to yours, but I follow them because I want to. Nothing is forcing me to. No one every said that "the only thing in life is myself and my own pleasure". I don't think that. I am considerate of other people. I just don't believe in God. The two things are not incompatible.
Please don't quote scriptures, because I don't count them as I reliable source of evidence. If you're trying to prove the existence of God to me, then it makes no sense that you should quote something I don't believe in.
You don't need to be religious to be a 'good' person.
At this point I must interject to say that I resent what WongFeiHung said about "middle eastern poor people". I am Arab (well, half Arab - my dad is Moroccan), and poor people in the Middle East are not necessarily in that situation because they didn't make up religion. They do have a religion, it's just not Christianity. I doubt religion has much to do with your financial well-being.
Anyway, back to my reply to Insight's post.
Saying that the texts have not changed at all is RIDICULOUS AND UNINFORMED!! Religious scripts have been modified a great deal, not necessarily on purpose, but the Bible as it is now has undergone huge modifications. Not that it makes any difference; in my opinion, it's still all BS but whatever... WongFeiHung is right, look it up some time and you'll see for yourself.
Ok now you're saying that minotaurs and dragons existed? This doesn't give a very good impression of you as a reliable person with whom to debate religion.
Look I'm not going to get in that whole angel thing, because I'm sure I wouldn't be able to change your mind - but I don't believe it.
Ok so God never says anything about doing your sister. So incest is okay, but homosexuality isn't? Or was God too busy condemning gays that he forgot about the incest thing?
Good grief...
So as far as I'm concerned we're just cells, molecules and atoms. Once the electricity, the chemistry, stops working in your brain, that's it; no more. You're history. You can talk about fairness, but that's just something you made up. It's an
idea. The universe isn't fair or unfair; it works by mathematics, physics, chemistry, biochemistry... Things happen; it takes a mind to come along and call them fair or not. You people are too frightened to admit how big everything else is, what the scales of the universe are, compared to ours; distance and time. You can't accept that individually, we're microscopic; here for an eye-blink. You can't believe you're not the centre of things, so you come up with all these pathetic stories about God and life after death and life before birth, but that's cowardice. Sheer cowardice. And because it's the product of cowardice, it promotes it; "The Lord is my shepherd". Thanks a f***ing lot. So we've to live like sheep. Cowardice and cruelty. But everything's okay, because we're doing the Lord's work. f*** the silicosis, get down that mine and work, n*****! Aw shucks; sure we skinned her alive and threw her in the salt pans, but we were only doing it to save her soul. Lordy lordy, gimme that old time religion and original sin. Another baby for perdition... sh**; original sin? What sick f***wit thought that one up? My best friend died two years ago and I didn't try to dignify it with what's supposed to be metaphysical angst; it's also known as superstitious sh**. He's dead, and all there is is what he left behind. Art, in Jamie's case. That's more than most get. And there's also how people remember him. Isn't that enough? Do I have to make myself feel better by insisting that "his soul is living on"? No, I don't. And you can call me defeatist or small-minded, but you're the small-minded ones. Just accept, for once, that you're insignificant. Once you do that, you can let it go if you want to. All your bullshit religious beliefs will disintegrate, and, trust me, you'll feel so much better for being a rational human being. It's a kind of catharsis. Remember when you found out that Santa didn't really exist? There's the initial disappointment but you learn to accept it. And YOU CAN STILL BE A GOOD PERSON AND DO GOOD THINGS.

Being an atheist does not make you immoral. It just makes you rational.