Raises a question of symantics, as what is the meaning of the word spritual? If a principle meaning of the word in most contexts is that which nobody can understand, then at extreme levels of size (and perhaps time) everything is spirtual. Eg. of what is an electron made of, or what is space?
Most people who call themselves spiritual claim to not be religious, as in "I'm spiritual but not religious." They clearly don't mean spiritual as opposed to physical. No one is claiming to be nonphysical. Just what they do mean is pretty vague. I think they are Christians who don't wake up early enough on Sundays for church services.
Today my Christian coworker mentioned to my Christian boss he had thrown it in the trash (his copy of a piece of paper). I asked what he had tossed. He said: a jehovah witness propaganda. And had a face like it was crap stuff.
How respectful and accepting is that? So hypocritical
I do love the idea of a 'signed copy' of the Bible however....ha ha. I see some religions as being divisive...us against them. Those who belong are convinced that they are somehow 'better' than those who don't. Some are blessed and the rest will be punished. And this kind of thinking creates the tendency for inhumane actions It justifies our wars and 'ethnic cleansing' efforts. And it gives the impression that the poor deserve their fate in this world. (ie: God made it this way for a reason...God's will).
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Spiritual could be termed non physical because we can't sense it, measure it or observe it.
Being non physical you cannot define it; give it rules and boundaries.
Religion is nothing but rules and boundaries
So nonphysical religion, or spiritual religion, is an oxymoron.