It wasn't that the priest wasn't letting them in - but they couldn't get to where they wanted to go by that door. He was trying to tell them they had to go in a different door to get to where they were going. But they weren't listening to his very patient explanations. He was saying "look, you want to go to the Sanctuary. Okay, go back that way and take the next door". But they weren't heeding his advice.
I just can't understand why the church and catholicism would be in my dreams at all. I am not religious and in fact, this may sound rude, I view catholicism and all it's mysteries in somewhat the same way someone might view an ancient tribe and it's shaman or witchdoctor. It's just not a part of me - very foreign. So your ideas about being a bride or body of the church is quite good but I just can't see it being me.