I've seen this sort of statement made more times then I can count. And all I can continually say is...I disagree strongly.
Why is religion a form of spirituality or how is it you may ask to me? Simple, religion is not excluded from the list of experiences that can be 'spiritual'. In essence there is something I can't quite accurately describe that is the true reason why religion can be a 'spiritual' experiences. Perhaps it has to do with enlightenment? Perhaps something else, the important thing is, if you truly believe in the path you have chosen religiously and possibly even feel enlightened from the experience, then who is to say this is not truly what it means to have a spiritual experience?
Let us define the word 'Spiritual' and see what we come up with:
1. of, pertaining to, or consisting of spirit; incorporeal.
2. of or pertaining to the spirit or soul, as distinguished from the physical nature: a spiritual approach to life.
3. closely akin in interests, attitude, outlook, etc.: the professor's spiritual heir in linguistics.
4. of or pertaining to spirits or to spiritualists; supernatural or spiritualistic.
5. characterized by or suggesting predominance of the spirit; ethereal or delicately refined: She is more of a spiritual type than her rowdy brother.
6. of or pertaining to the spirit as the seat of the moral or religious nature.
7. of or pertaining to sacred things or matters; religious; devotional; sacred.
8. of or belonging to the church; ecclesiastical: lords spiritual and temporal.
9. of or relating to the mind or intellect.
–noun
10. a spiritual or religious song: authentic folk spirituals.
11. spirituals, affairs of the church.
12. a spiritual thing or matter.
In at least a few of the definitions it mentions religion as a basis of spirituality. If that is what the dictionary says, then how can someone argue?
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"For many are called, but few are chosen" - Matthew 22:14 ver. New American Standard.
"Though my soul is born from darkness, it shall rise in perfect light, I have loved the stars too fondly, to be fearful of the night". Unknown
"On those nights that I gazed upon the full moon in longing it was always you that my heart was calling and it is now I realize you are the one." - me