Opinion by Mark Schacter, special to CNN

(CNN) - I don’t believe in a divine presence, nor do I subscribe to any organized religion.

And that, perhaps oddly, is why I am drawn to the mystery of faith.

With the wonderment of an outsider, I try to understand the seemingly incomprehensible (to me, at least) pull that faith exerts over so many people's lives.

As a photographer approaching this mystery, I am confronted by what might seem like a contradiction: Photographs capture what can be seen, and yet faith is often invisible.

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