Permaculture has no metaphysics or other forms of spiritualism

That's right it doesn't. No where is any religion, spiritualism, or metaphysics taught anywhere. It does however help with bringing a community closer together. Craig over at PRI has set forth exactly how I feel over this topic right here.

Permaculture is not, and should not, be directly associated with a particular set of beliefs. Permaculture can and should be implemented by every culture and by people from every spiritual or non-spiritual background. By directly associating permaculture with a particular, specific, belief system you are ruling out participation from all those with other belief-sets. You are marginalising permaculture, and saying that to be a permaculturist, you must agree with this subjective belief system.

It's a heated topic to be sure with over 100 replies at the time of writing this. To understand where PRI, myself and Permaculture is truly coming from, please read here.