The question you bring up is what is spirituality? According to wikipedia:
Spirituality can refer to an ultimate or an alleged immaterial reality;1. an inner path enabling a person to discover the essence of his/her being; or the “deepest values and meanings by which people live.” 2. Spiritual practices, including meditation, prayer and contemplation, are intended to develop an individual's inner life; spiritual experience includes that of connectedness with a larger reality, yielding a more comprehensive self; with other individuals or the human community; with nature or the cosmos; or with the divine realm. 3. Spirituality is often experienced as a source of inspiration or orientation in life. 4. It can encompass belief in immaterial realities or experiences of the immanent or transcendent nature of the world.
So I can't see someone being spiritual if they don't believe in anything or don't follow anything. If they're still spiritual it's just because they've made up their own belief and what to follow!
It's kind of like when atheists say they don't believe in any religion?? Reallyyy I think atheism is its own religion! You believe there is no God, and I believe there is!
The more I learn about new science, the more I'm just amazed that human beings are not humble. We actually know nothing...