The number of Americans who identify as 'spiritual but not religious' is growing, especially among millennials who may not be finding what they need in the religious institutions of their parents generation.

While some of the "Nones" have never affiliated with a particular religion, those who have some connection to faith yearn to find meaning they can't find in traditional churches, synagogues and mosques.

We look at why people -- especially millennials -- are becoming disaffected with religion, how mainstream institutions are responding (or not) to their departure, and how others are finding that the path to religion often goes through the arts much like it did centuries ago.

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Rig Veda Hymn to Agni, Mandala X, Sukta 191, the last hymn of the Rig Veda