Do you think spirit needs a belief?
Perhaps we have different ideas on what is "spiritual."
I think spirit can play with beliefs but in essence it is that which is no belief and yet the potential for an infinite amount of beliefs.
Unless you are talking about a collections of ideas of what spiritual is then that would be just another religion. Perhaps a religion only adhered to by one person but still a religion.
This is why the concept of infinite potential is so important to grasp. Because it is the potential for all beliefs and all amalgamations. It allows the experience of everything. His belief. My belief. Your belief. There beliefs.
Wouldn't ya like ta be a Pepper too....
Anyway, I hope that made sense.
What we see in our world is those who bring together a system of belief that creates fragmentation within the psyche and along with it, loss of creative freedom and power.