I guess the core of the confusion is treating atheism like an axiom of some kind. Modelling an atheist as someone who just somehow randomly decided that there are no gods, and is not thinking about the correctness of this belief anymore, only about the consequences of this belief. At least this is how I decode the various "atheism is just another religion" statements. As if in our belief graphs, the "atheism" node only has outputs, no inputs.
I am willing to admit that for some atheists it probably is exactly like this. But that is not the only way it can be. And it is probably not very frequent at LW.
The ideas really subversive to theism are reductionism, and the distinction between the map and the territory (specifically that the "mystery" exists only in the map, that it is how an ignorant or a confused mind feels from inside). At first there is nothing suspicious about them, but unless stopped by compartmentalization, they quickly grow to materialism and atheism.
It's not that I a priori deny the existence of spiritual beings or whatever. I am okay with using this label for starters; I just want an explanation about how they interact with the ordinary matter, what parts do they consist of, how those parts interact with each other, et cetera. I want a model that makes sense. And suddenly, there are no meaningful answers; and the few courageous attempts are obviously wrong. And then I'm like: okay guys, the problem is not that I don't believe you; the problem is that I don't even know what do you want me to believe, because obviously you don't know it either. You just want me to repeat your passwords and become a member of your tribe; and to stop reflecting on this whole process. Thanks, but no; I value my sanity more than a membership in your tribe (although if I lived a few centuries ago or in some unfortunate country, my self-preservation instinct would probably make me choose otherwise).
A few notes about the site mechanics
A few notes about the community
If English is not your first language, don't let that make you afraid to post or comment. You can get English help on Discussion- or Main-level posts by sending a PM to one of the following users (use the "send message" link on the upper right of their user page). Either put the text of the post in the PM, or just say that you'd like English help and you'll get a response with an email address.
* Normal_Anomaly
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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.