I'm honestly not searching, though, so even the Unitarians feel awkward. At least as I understand it, Unitarianism is still at least deistic. The most I could offer would be moral introspection and some meditation work, none of it in real connection to the supernatural. I'm not opposed to religion on principle, but I'm certainly not trying to find something to place my faith in.
If anything, the best I can see aiming for is some equivalent to cultural Judaism, where even non-believing Jews are invited to attend major ceremonies.
Same boat here. I've repeatedly thought about going to UU events, but they're still too New Age for me. I've long been somewhat envious of my Jewish friends for the strong community aspect of the culture, which requires too much religion in other, well, religions. Nothing else seems to really drive as much community though, as far as I've seen at least.
I feel like this is a surprisingly common response (especially since so many people in the tech world meet a lot of practicing-but-nonreligious Jews). I have a lot of respect for UU organizations, but I just don't feel like I fit in with it, and I haven't found a good substitute. Solstice parties and their ilk are A) too rare for community-building and B) sort of a pallid imitation of real organizations.
Hobby groups and community organizations offer a bit of this, but it seems like there's a fairly specific identity/culture gap that's not easily filled with anything else for non-Jewish atheists/agnostics.
If anything, the best I can see aiming for is some equivalent to cultural Judaism, where even non-believing Jews are invited to attend major ceremonies.