I guess 90% of people are some sort spiritual. Spirituality is a fundamental part of a human being, don't ask me why, it's just my empirical knowledge about that. I don't know if it is a product of evolution (intelligence) or really there is a Creator that gave us the chance to "know" him. I admire the really spiritual people, because they sometimes serve as an example of conduct, but hear me, only the REALLY spiritual people, not the fake ones or the hypocrites. If you want to be spiritual, go ahead, know that only the irrespectful people are going to call you things.
And just to tell you, the most skeptic people I know are old age. Young people are feeling somewhat uncomfortable with the world we are living in, so I guess spirituality is going on a rise on young ones.
Personally I don't know if I am spiritual or not. I just like to keep people around me happy and to obey my moral laws. Call me spiritual if you want, or not, cause that's not going to change me a bit.