Well, geez... that's scary! Did the monk seem angry with him? Was it one long scream, or was the monk essentially cussing him out?
Here's what I found at dreammoods.com-
Church
To see the outside of the church in your dream, signifies sacredness and spiritual nourishment. It is representative of your value system and the things you hold sacred.
To see the inside of a church in your dream, signifies that you may experience some minor setbacks. However, what seems to be nuisances will turn out to be a blessing in disguise.
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Monk
To see a monk in your dream, signifies devotion, faith, and spiritual enlightenment.
To dream that you are a monk, symbolizes the introspective aspect of yourself. You need to emotionally withdraw yourself from a situation and regain some control, structure, and order.
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Scream
To dream that you are screaming, symbolizes anger and fear. It is an expression of your powerful emotions which you have kept pent up inside.
If you try to scream, but no sound comes out, then is suggests that you need to immediately confront some situation. Perhaps you are unable to pinpoint your fears or feelings.
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Maybe he needs to have it out with someone? I don't know... maybe someone else will have a better idea.
Kell