Also, while we're defining terms, I mean to use the term "agnostic" in the normal sense, i.e. a person that does not claim belief or unbelief because they do not know. In that sense, atheists are not also agnostic.
I hope my post was provocative without being unnecessarily antagonistic. But I am convinced the evidence for a God is pretty overwhelming. We're surrounded by evidence; the parts of my body are infinitely more complex than the computer in front of me. And I don't just mean that they're more complex in their structure or processes (which they are) but every cell is more complex in its information. Somehow this organized, coherent, useful data in my DNA exists in a world that supposedly has no direction or intelligence. Does information spring out of mindlessness? Does life spring from inanimate material? Organized information is evidence of intelligence (e.g. SETI). Engineering is evidence of an engineer.
Beyond this, we have a moral component. Humans everywhere have a basic knowledge of right and wrong. We don't normally murder those we love or disrespect those we want to impress; we've never sung songs praising cowardice and failure. People don't always honor these standards but, when we don't, we feel guilt and remorse. Why? I suggest that we know there is a higher moral standard than mere nature, red in tooth and claw. Atheism has historically had a hard time arguing why natural man should be so unnaturally moral.
In the end, I don't suppose that I'll convince you to swerve from your faith anymore that I will swerve from mine. But I ask that you'll fairly consider both sides with an open mind. What if there is a God who created this somehow and can assign value to you as a living being? What if he has expectations?!
If you're like most of us, this doesn't really come down evidence and arguments and philosophical debates. The real reason we don't believe in God is this: we don't want to. It's not about evidence for or against God; it's more often about peer pressure and fear and bitterness and pride. In our own minds, to stop believing is a reprieve from authority and accountability. We can live like we want because, in the end, no one is going to question us on it.
Responses from a friendly atheist on the internet:
First, how can someone say they believe there's no God? How do they make that claim, not having searched every corner of the universe at every point in time?
The same way I can say I believe there are no werewolves, even though I haven't searched every corner of the earth.
At least an agnostic is honest enough to say he just doesn't know.
I don't claim to know either, but I don't go around claiming that theists can't know for sure and should also be re-categorized as agnostic.
Theist: believes 1 or more gods exist.
Atheist: someone who is not a theist.
I'm not a theist. There are no gods that I think exist. I'm an atheist.
I'm also agnostic, because agnostic refers to knowledge, not belief.
But an atheist has such a big chip on his shoulder that he claims for himself god-like knowledge about the existence of God.
I assume you're an atheist regarding, say, Zeus. You don't think Zeus exists, or any of the other thousands of gods, except for one. I just don't stop at that last one.