Some people might object to calling racism-1 racism, and instead will decide to call it "human biodiversity" or "race realism". I think this is bullshit. Just fucking call it what it is. Own up to your beliefs.
Well, if you think races are a real thing, then calling this belief race realism seems fairly clear, and helps distinguish your belief from type-3 racism. Human biodiversity implies something more like support for eugenics, to me, since you're saying that humans are diverse, not that race is a functional Schelling point.
Stripped of connotations, "race realism" to me implies the belief that empirical clusters exist within the space of human diversity and that they map to the traditional racial classifications, but not necessarily that those clusters affect intellectual or ethical dimensions to any significant degree. I'm not sure if there's an non-euphemistic value-neutral term for racism-1 in the ancestor's typology, but that isn't it.
(The first thing that comes to mind is "scientific racism", which I'd happily use for ideas like this in a 19th- or early 20th-century context, but I have qualms about using it in a present-day context.)
A few notes about the site mechanics
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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.