Believing in spirituality without religion leads to a cognitive dissonance.
My philosophy is that there are too many things that we simply cannot observe due to the limitations of our senses and thought/imagination, so to dismiss god is not truly rational.
Spirituality is removed from any material success, so to go into any spiritual practice for an "edge" is not right.
If you want an edge in the material world then persuasion psychology and probability theory are your friends.
Also we tend to forget that science is a philosophy that does not say this is how the world is, but says this is how we understand the world. It's important to keep that distinction in mind.