The best term for me is probably UU/Humanist, but I have found that none of these labels are adequate, and that's okay.
I chose Christianity, Secular/NonReligious/Atheist/Agnostic, Neo-Paganism and Other (to include my own form of pantheism, which depending on your perspective might also be considered panentheism, but both words wouldn't really encompass my experience there, either, only come close to it.)
I probably could have chosen Buddhism in some ways, but I didn't because I still don't know a lot about it. I have experimented with centering prayers, sometimes in Christian form, though there isn't much of a difference, at all, from Buddhist centering prayer/meditation. It is my understanding that Christian monks and nuns picked up the practice from Buddhist monks centuries ago. A UU friend of mine, a very special and joyous person to me, has introduced me to an Al-Anon group. The God language is uncomfortable to me, but God can be anything in Al-Anon, even the Al-Anon group itself. (She had the same issues coming into Al-Anon.) In many ways, its principles and slogans remind me of Buddhism -- there are slogans, mantras, thought-stopping/meditation techniques to deal with anxiety, anger, etc., and an emphasis on acceptance, one day at a time, take it easy, focus, meditation, prayer. In many ways I find it similar to the Buddhist idea of detachment. Al-Anon literature draws from many sources -- poetry, world religions, etc.
As for Christianity, I find many traditional practices and holy days beautiful in their own way, but that is probably because of their similarity to neo-paganism, which I also find beautiful. A History of God really influenced me and the Eastern Orthodox view of the trinity strikes me as more spiritual and more compatible with the Christian doctrine of Unitarianism than the doctrine of the trinity as it is emphasized in the West. (The Orthodox are trinitarians, but their orientation is more mystical and emphasizes the mystery and unity of the Godhead whereas in the West, the trinity is often more intellectualized and the distinction of the persons is emphasized over unity.) While I don't believe in gods, the trinity was once described to me as a communion between the Father, Son, and Holy Spirit (also referred to as the Mother, Child, and Womb in some liberal churches) and that the love between the Father and Son is so strong that the Holy Spirit is the love itself between them, the bond of union. I thought this was extremely beautiful as poetry. However, I don't feel completely comfortable in Christian churches. It feels like something is missing. I don't feel much inspiration from reading the Bible, either. While there might be appealing aspects of Christianity, it is my understanding that Christianity is something different from the Bible -- there are connections, Christianity is based on the Bible, but the Bible is often so ambiguous, strange, and antiquated that I don't think there is any "biblical" Christianity -- the Bible is often contradictory or confusing or lost in translation, etc. I have read some of the books left out of the Bible, like the Gospel of Thomas, and I find these even less fulfiling.
Neo-paganism is interesting to me, especially because of its compatibility with pantheism and even Humanism -- there is no universal, authoritative neo-pagan creed. I have neo-pagan friends who have influenced me. I don't have any connections with the gods, but I enjoy reading about them -- in Greek mythology recently -- because of how human they are. They are reflections of ourselves, our psyche. I find Greek mythology a more rich source than the Bible, but everyone's different.
Secular/Non-Religious/Humanist/Atheist/Agnostic. This describes my worldview and the ethics that I (try) to live up to. I think all Unitarian Universalists are humanists in a more general sense of the term in that they stand up for their ethics and challenge perceived injustice whether it comes from secular or religious authority. There is no room in UU'ism or Humanism for quoting an ancient text, even the Bible, to justify cruelty or injustice. This type of general humanism is a natural outgrowth of democracy and the separation of church and state -- human good (and life on the planet in general) comes first, and religion is not a legitimate excuse to harm others or to excuse ignorance. Both UUs and Humanists believe in a "free and responsible search for truth and meaning."
I chose "other" for pantheism or panentheism. That one's a little difficult to explain. A short explanation is that, for whatever reason -- I look toward neurotheology for an explanation -- I have had experiences that some neo-pagans might say were the gods, though I tend to think of them as "friends" or "helpers." It is my understanding that they are a part of me, my psyche, and come from me, representing an interconnection between "me" and the rest of the universe. They exist in my mind, my mind stems from my body and brain, which stems from the universe, an interconnected whole. They are emergent from the universe, as I am, but I don't think they objectively exist any more than I do. I just call it pantheism/panentheism, but if anyone asked, I'd just say I was an atheist because I doubt most people would get what I'm saying (like I said, no labels seem adequate for me, except UU). I don't believe these experiences are supernatural in any way, but I doubt some of my other atheist friends would really relate to it, and often times, I don't even know how to relate to it or how to connect with them on a more consistent basis. Since learning about UU, though, I have heard of other Humanist/atheists with similar experiences, and they often blend their Humanism/atheism with neo-paganism and pantheism. It might help to join a meditation group, though I don't know of any nearby. There is a Christian church nearby that practices centering prayer (also used in Buddhism), however, and I might try that.