Many factors play on this loaded word: Religious.
An explanation of Spiritual but non Religious it's no different than to define the word Religious .
Many different definitions can be provided by almost every person you ask, since each person hold a concept unique to his/her idea of what the word means to the individual in question, which almost certainly will be different to each individual. Words as labels carry too many implications or associations of preconceived ideas, why then be surprised that calling yourself Spiritual but non Religious can yield so many different meanings according to the person you ask?
Unfortunately calling yourself anything you wish to name yourself has little, or none of what you want to convey. A more likely outcome will be that most people would give you a label and throw you in one of their many labeled mind compartments according to their own beliefs, and opinions, like: Nutcase, moron, bigot, fanatic, irrational, hypocrite, ignorant, simpleminded, well meaning, but misguided, live in lalaland, kumbayah, etc.
As a matter of fact that last word Kumbayah a simple a spiritual song first recorded in the 1920s. It became a standard campfire song in Scouting and summer camps, and enjoyed broader popularity during the folk revival of the 1950s and 1960s.The song is originally a simple appeal to God to come and help those in need, but more recently it is also cited or alluded to in satirical or cynical ways which suggest false moralizing, hypocrisy, or naively optimistic views of the world and human nature.
Ultimately Religious, or Spiritual but non Religious are labels, with a different meaning, by those who like to box in, and define people, for their beliefs, rather than focusing in tolerance and acceptance, words as labels, and beliefs should not, and do not define us, but our actions do:"Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles?"
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