I agree with Jack here, but I'm going to add the piece of advice that used to be very common for newcomers here, although it's dropped off over time as people called attention to the magnitude of the endeavor, and suggest that you finish reading the sequences before trying to engage in further religious debate here.
Eliezer wrote them in order to bring potential members of this community up to speed so that when we discuss matters, we could do it with a common background, so that everyone is on the same page and we can work out interesting disagreements without rehashing the same points over and over again. We don't all agree with all the contents of every article in the sequences, but they do contain a lot of core ideas that you have to understand to make sense of the things we think here. Reading them should help give you some idea, not just what we believe, but why we think that it makes more sense to believe those things than the alternatives.
The "rigidity" which you detect is not a product of particular closedmindedness, but rather a deliberate discarding of certain things we believe we have good reason not to put stock in, and reading the sequences should give you a much better idea of why. On the other hand, if you don't stick so closely to the topic of religion, I think you'll find that we're also open to a lot of ideas that most people aren't open to.
If we're to liken rationality to a martial art, then it would be one after the pattern of Jeet Kune Do; "Adapt what is useful, reject what is useless." A person trained in a style or school which lacked grounding in real life effectiveness might say "At my school, we learned techniques to knock guys out with 720 degree spinning kicks and stab people with knives launched from our toes, and they were awesome, but you guys just reject them out of hand. Your style seems really rigid and closed-minded to me." And the Jeet Kune Do practitioner might respond "Fancy spinning kicks and launching knives from your toes might be awesome, but they're awesome for things like displaying your gymnastic ability and finesse, not for defending yourself or defeating an opponent. If we want to learn to do those things, we'll take up gymnastics or toe-knife-throwing as hobbies, but when it comes to martial arts techniques, we want to stick to ones which are awesome at the things martial arts techniques are supposed to be for. And when it comes to those, we're not picky at all. "
Oh, and since I currently have negative karma, I'm unable to directly respond to your other comments.
In response to this one:
If Mormonism is incorrect, do you want to know that?
It's a very important question and one I need to think about more. In the next few days I'll write a Discussion post addressing my beliefs, including why I'm planning not to lose my faith at the moment.
And this one:
But you haven't showed much willingness so far to discuss your reasons for your belief in which way the evidence falls or ours.
Perhaps it's not fair of me to ask ...
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
* Randaly
* shokwave
* Barry Cotter
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.