From personal experience in the workplace...don't share anything you would regret later. Really think about how it would effect your relationship. Because like you said, you'd have to face each other on a regular basis.

None of my work place friends know about my mental disorders. None of them know I am Pagan (like you). None of them know I'm pansexual instead of straight. Few of them even really know my interests. I rarely share my educational background or that I have an above average IQ. I'm extremely cautious about what I let people know about me. In fact, I pretend to be someone I'm not at work because that's what they're paying me to do (I work retail and have to pretend I love people and that I'm a friendly person). I pretend to be clueless and even stupid at times. The workplace is a complex environment, and its better to look out for yourself.

I know I sound paranoid, but I have personal experience with sharing too much with a boss and complications arising between us. Now I'm in a really difficult situation and wishing I hadn't let my guard down or boundaries to be blurred. Always set sound boundaries. Sometimes you have to accept that this is as deep as you go with someone that is your friend and leave it at that. When there's too much to risk.