Religion cannot be defined so simply as the belief in the supernatural. Far too often it is characterized this way. Religion is defined as the belief in an untouchable god that seems to do nothing more than to comfort or create tension and atrocity.
If religion is nothing more than the belief in some grand scheme for which there is no effect within the natural world then religion is baseless. Modern spirituality, then, would simply be an echo of a primitive thought pattern that allowed for tribal unity in our ancestors.
This is the reductive mindset that is growing more popular in todays world.
However, this is not a true understanding of religion.
Spirituality is an experience, a state of being; an action.
I've recently experienced a state of profound awe, unity and love (for lack of a better word) that seemed to transcend time and space. After searching the web for information about what had transpired I found the term Peak Experience. I also found a book by the psychologist Abraham Maslow called Religion, Values and Peak experiences.
It can be found online here:
Religions, Values, and Peak Experiences
Apparently my experience was rather mild compared to others.
Peak experience seems to be underlying basis for the spirituality of all cultures. Each tradition interpreting this state of being according to their own cultural context.
This profound state has been studied scientifically:
MeaningofLife.tv
There seems to be more to the world than what our five physical senses tell us.