If you lived in a world where any of the things you described in your comment occurred you wouldn't be impressed by them.
What does being "impressed" have to do with anything? I'm talking about believing in someone's existence.
I don't deny the existence of the Pope. I don't deny the existence of the American President. I'm not impressed by either but I don't deny them. I don't deny the past existence of dinosaurs. I don't even deny the existence of King David and Agamemnon as historical figures. I make fun of the people who deny the existence of historical Jesus (or Socrates or Mohammed). So why would I deny the existence of God, if I saw a world that looked to me like it has more evidence about his existence than his non-existence?
You are assuming that I started looking this from a non-believer's perspective, but it's what made me an unbeliever. Back when I was at school I started by just disbelieving in the Genesis story because the world looked like it would look as if evolution was true -- a God throwing around dinosaur bones to prank us was even more incompatible with Christianity than "look, it's not meant as a literal story". Then step-by-step, more and more things spoken by Christianity just didn't seem to fit the world around me. Not the omnibenevolence and omnipotence of god, not the nature of the soul (why does the mind depend so much on biochemistry of the brain). By my college years only some unanswered questions about the mystery of consciousness or existence could be said to even be used as a hole to fit a relevant God in.
From "Christian" in my childhood to "Christian mostly but I don't accept everything that religion says" in highschool, to "agnostic" in college, to "agnostic-leaning-atheist" in my post-college years, and finally having the guts to just say "atheist".
I didn't start from a position of disbelief which I found ways to maintain -- I started from a position of belief which could simply no longer be honestly maintained in the face of the evidence.
What does being "impressed" have to do with anything? I'm talking about believing in someone's existence.
It has to do with computing P(our universe|God exists).
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A note for theists: you will find the Less Wrong community to be predominantly atheist, though not completely so, and most of us are genuinely respectful of religious people who keep the usual community norms. It's worth saying that we might think religion is off-topic in some places where you think it's on-topic, so be thoughtful about where and how you start explicitly talking about it; some of us are happy to talk about religion, some of us aren't interested. Bear in mind that many of us really, truly have given full consideration to theistic claims and found them to be false, so starting with the most common arguments is pretty likely just to annoy people. Anyhow, it's absolutely OK to mention that you're religious in your welcome post and to invite a discussion there.
A list of some posts that are pretty awesome
I recommend the major sequences to everybody, but I realize how daunting they look at first. So for purposes of immediate gratification, the following posts are particularly interesting/illuminating/provocative and don't require any previous reading:
More suggestions are welcome! Or just check out the top-rated posts from the history of Less Wrong. Most posts at +50 or more are well worth your time.
Welcome to Less Wrong, and we look forward to hearing from you throughout the site!
Note from orthonormal: MBlume and other contributors wrote the original version of this welcome post, and I've edited it a fair bit. If there's anything I should add or update on this post (especially broken links), please send me a private message—I may not notice a comment on the post. Finally, once this gets past 500 comments, anyone is welcome to copy and edit this intro to start the next welcome thread.