I'm spiritual but not religious. I believe in something outside of our very existence, something that can't be percieved with our five senses. I also believe in the idea of a "force" that balances the universe, which may or may not care about humanity and our dealings.
I also believe in the idea of a "soul" or at least something more than just our physicalities. Something more "permanent" than the things we have. Maybe its an ego centric belief but I can't imagine that all our dreams, memories, ideals, experiences, etc. would simply be forever lost to time.
But I'm not religious. I don't belong to any organized religion and I never will. While I do admire some of the people who spawned the religious movements (for example: Jesus of Nazareth and Sidharta, etc.) and some of their greater followers (Ghandi for example), I could never involve myself with any because the majority (though NOT all) have really lost the true teachings of these people and no longer really stand for anything.
Religion, to me, can be like training wheels on a bike. It's an easy way to start but to use them forever defeats the purpose. I think that once after, religion can become a superficial way of finding answers rather than seeking them yourself (even if you find that there is no answer or come to the conclusion that there is nothing beyond what we can percieve, it's your own answer and that is the whole point).
It's difference between being told about the moon and actually ACTIVELY seeking to understand it yourself and explore it (though, because it is something intagible, the spectrum of exploration is massive and almost unlimited).
Don't get me wrong. I don't hate religions. Some of them have made some good contributions to the world and religion HAS inspired some incredible works of art and architechture.
And although that doesn't make up for the flaws (or for some of the horrible crimes commited against humanity in the name of religion), at least they have done some positive things.
To me though, most religions have a too strong a black and white view of "right" and "wrong," of "universal truths," and obessions with ritualism.
Personally, I have never felt that any of that could ever lead to liberation of the "spirit" or the inner-self. I feel that ritualism and
such harsh/unyielding views of the world cause stagnation and actually go as far as to sabotage a person's growth in many cases. I think religion, in most cases, is quite the oppesate of spiritualism. Hence why, I would say that yes, it's possible to be spiritual but not at all religious.