Hmm. This should be amusing...

I thought about it a few days and took a stab at it. Warning: Edits might follow if I find something goofy.
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Spirituality is all about the ineffable.
Religion is a representation of the ineffable.
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Spirituality is never false because it is not articulable.
Religion can be falsified because it is represented. By representing the ineffable, you've erred.

And the error is public.
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Spirituality does not entail working with a community.
Religion by definition entails working with a community.
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Spirituality is not documented.
Religions, aside from a few pre-literate ones, are documented, even if by oral tradition.
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Spirituality need not embody stories.
Religion represents the ineffable by means of stories.
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Spirituality comes from a single vantage point.
Religion is shared among many people, therefore it is viewed from many vantage points. Indeed, the stories are often about a variety of vantage points, a variety of people.
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Spirituality involves little effortful learning.
Religion involves understanding what is represented. Enlightenment, if such a thing exists, is understanding how what is represented is in error, but appreciating it's value in helping grasp the ineffable.
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Spirituality that is muddled can stay muddled.
Religions that are muddled can stay muddled, but not without some criticism.
