Spirituality is very personal. It answers the inner
call of the individual. Spirituality can be as numerous as there are
life-forms in the universe. Spirituality generally leads to inner contemplation.
This usually leads to personal feeling of peace and completeness.
Generally, we can group some of these spiritual aspirations together and people
than form loose knit communities where people have similar questions and more
importantly - similar answers. When these "communities" have powerful,
inspirational "leaders", they usually form "religion".
Religion is a man-made institution. It usually
addresses the spiritual and social aspirations of the people at the time of its
creation. Like its makers, it has its great insights and its blind spots.
Over time, like all human institutions, all religions accumulate redundant
practices and processes. Unlike other institutions, attempts to update and
reforms old practices and processes in religion are resisted with great vigour
and even labelled as "anti-god" !
Hence, spirituality can lead to formation of a religion, but, religion, being a
human institution, doesn't always lead to spirituality.