Jay, I can certainly empathize with your concern for your friend. However, as a practicing Catholic I can assure you that your friend will not be surrounded by people trying to convince her that she needs to "repent" of her sexuality. There's less that I can say about dark side epistemology (since you would probably consider me to be an adherent of it!) but I can assure you that Leah is not going to have piles of nonsensical doctrine shoved down her throat. She will be introduced to many ideas, but ultimately she herself will decide what to accept and what to reject (and I highly doubt that she will accept absolutely everything that the Church teaches - many Catholics don't).
I must confess that, as an outsider to (but occasional reader of) Less Wrong, I find certain statements and arguments on this site to be just as totalizing and dogmatic as the most dangerous religious fundamentalism. There's also a fair amount that I find personally offensive to my value system. However, whenever I find myself going into a nasty tirade against LW, my atheist rationalist friend (who introduced me to this site in the first place) urges me to remember that not all Less Wrongers are the same. Opinions about things like the Singularity vary greatly, as do values. And, there are even some theists on this site.
I can tell you that the same is true about Catholicism. It's a very large organization with many people who interpret their religion in many different ways. Yes, there are many things wrong with the Church as an institution, but people know this and some are trying to reform these flaws (indeed, if Leah does convert, she will be a great one to do this). As for the epistemological side...I don't think that Leah is going to reject scientific truths, if that is what worries you. She might just come to view them in a somewhat different way.
Having read Leah's blog for a while, I know that she will respond very well to any challenge/debate you put forward. However, I would advise against trying to thwart her conversion. Ultimately, she has to make her own decisions. As others have said, listen to her and try your to understand the reasons for her conversion. Also, if you haven't already, get to know a few Catholics. We could be wrong, but that doesn't make us bad people.
...I must confess that, as an outsider to (but occasional reader of) Less Wrong, I find certain statements and arguments on this site to be just as totalizing and dogmatic as the most dangerous religious fundamentalism. There's also a fair amount that I find personally offensive to my value system. However, whenever I find myself going into a nasty tirade against LW, my atheist rationalist friend (who introduced me to this site in the first place) urges me to remember that not all Less Wrongers are the same. Opinions about things like the Singularity vary gr
I recently learned that a friend of mine, and a long-time atheist (and atheist blogger), is planning to convert to Catholicism. It seems the impetus for her conversion was increasing frustration that she had no good naturalistic account for objective morality in the form of virtue ethics; that upon reflection, she decided she felt like morality "loved" her; that this feeling implied God; and that she had sufficient "if God, then Catholicism" priors to point toward Catholicism, even though she's bisexual (!) and purports to still feel uncertain about the Church's views on sexuality. (Side note: all of this information is material she's blogged about herself, so it's not as if I'm sharing personal details she would prefer to be kept private.)
First, I want to state the rationality lesson I learned from this episode: atheists who spend a great deal of their time analyzing and even critiquing the views of a particular religion are at-risk atheists. Eliezer's spoken about this sort of issue before ("Someone who spends all day thinking about whether the Trinity does or does not exist, rather than Allah or Thor or the Flying Spaghetti Monster, is more than halfway to Christianity."), but I guess it took a personal experience to really drive the point home. When I first read my friend's post, I had a major "I notice that I am confused" moment, because it just seemed so implausible that someone who understood actual atheist arguments (as opposed to dead little sister Hollywood Atheism) could convert to religion, and Catholicism of all things. I seriously considered (and investigated) the possibility that her post was some kind of prank or experiment or otherwise not sincere, or that her account had been hijacked by a very good impersonator (both of these seem quite unlikely at this point).
But then I remembered how I had been frustrated in the past by her tolerance for what seemed like rank religious bigotry and how often I thought she was taking seriously theological positions that seemed about as likely as the 9/11 attacks being genuinely inspired and ordained by Allah. I remembered how I thought she had a confused conception of meta-ethics and that she often seemed skeptical of reductionism, which in retrospect should have been a major red flag for purported atheists. So yeah, spending all your time arguing about Catholic doctrine really is a warning sign, no matter how strongly you seem to champion the "atheist" side of the debate. Seriously.
But second, and more immediately, I wonder if anybody has advice on how to handle this, or if they've had similar experiences with their friends. I do care about this person, and I was devastated to hear this news, so if there's something I can do to help her, I want to. Of course, I would prefer most that she stop worrying about religion entirely and just grok the math that makes religious hypotheses so unlikely as to not be worth your time. But in the short term I'd settle for her not becoming a Catholic, and not immersing herself further in Dark Side Epistemology or surrounding herself with people trying to convince her that she needs to "repent" of her sexuality.
I think I have a pretty good understanding of the theoretical concepts at stake here, but I'm not sure where to start or what style of argument is likely to have the best effect at this point. My tentative plan is to express my concern, try to get more information about what she's thinking, and get a dialogue going (I expect she'll be open to this), but I wanted to see if you all had more specific suggestions, especially if you've been through similar experiences yourself. Thanks!