I am afraid its just not that simple.
Dictionary.com
1: the doctrine that God is the transcendent reality of which the material
universe and human beings are only manifestations: it involves a denial
of God's personality and expresses a tendency to identify God and
nature.
2: any religious belief or philosophical doctrine that identifies God with the universe.
American Heritage Dictionary
1: A doctrine identifying the Deity with the universe and its phenomena.
2: Belief in and worship of all gods.
Wordnet
1: (rare) worship that admits or tolerates all gods
2: the doctrine or belief that God is the universe and its phenomena
(taken or conceived of as a whole) or the doctrine that regards the
universe as a manifestation of God
American Heritage New Dictionary of Cultural Literacy
The belief that God, or a group of gods, is identical with the whole natural world; pantheism comes from Greek roots meaning “belief that everything is a god.”
Webster Revised
The doctrine that the universe, taken or conceived of as a whole, is
God; the doctrine that there is no God but the combined force and laws
which are manifested in the existing universe; cosmotheism.
As you can see my definition is not simply wrong.
I don't see how you can believe in anything mystical if you are a pantheist because to believe in something mystical is to believe in something "beyond reality" which is the opposite of trying to understand and live in harmony with reality its self. If you do then perhaps you are more of a panentheist, which means all in god. Perhaps there are many concepts that are around the area of pantheism but the most simple one is that God and Reality are are the same thing. If god and reality are the same thing then there is nothing supernatural about god, but god is the definition of natural its self. Similar to the way that to most punk rockers the word anarchy means "no order of any kind" but the more simple definition is "no government".
I am more then open to the idea that pantheism is an ambiguous confusing word that shouldn't be used or endorsed. But I know that thinking about things from that perspective was helpful in my own life. It helped me understand how ethics is mans relationship with reality rather then some supernatural being. And I think that reality has a lot of the aspects that people create with their gods. Isn't reality the only real authority? Don't we need to understand and live in harmony with reality to be happy or success? I just know that projecting some old beliefs onto reality helped me understand rational ethics, but perhaps thats all that its is good for.
Perhaps the time a great man becomes an average man, is when he apologizes for his honesty
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