I consider myself "spiritual, but not religious". I usually take "spiritual" in the sense "concerning the breath", in the sense of an unseen force that moves things. I know, that may not be too useful, but I think a lot of human experience isn't really scientifically explainable (at least not currently), or even easy to discuss. Spirituality is one way people attempt to make sense of life, in all it's messy details.
I also tend towards, for lack of a better term, the mystical. I am much more concerned with meditation and directly experiencing reality. I'm not especially religious in that I'm not too concerned with following some religion's doctrine, and disregard teachings that are obviously nonsense. (For example, I rule out Christian fundamentalism as I just can't see how it could possibly be true).
Basically, I think that there is no easy answer, and it takes a lot of work to understand things. I try to be open to things that I don't understand. I think that automatic skepticism is just as bad as automatic belief, and it's important to keep an honestly open mind. It's also important to think clearly, and be aware of your own emotions and motivations when trying to understand spiritual ideas.
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