I went to a Unitarian church service1 yesterday, the first time i’d ever done anything of that sort in my life — having been raised atheist, and Paganism being a quite lonely path — and it was… surprisingly affirming? I’ll say this much, at least: it’s the only hymn-book i’ve ever seen that features “Bread and Roses”.
I'm a UU atheist in the US and I really appreciate how at least my church focuses on doing good now, not what might happen after we die. We have a pagan group in our church; you might be able to find one in unitarian spaces if that's what you're looking for.