In regards to "Church Space":
1) ALL Catholicism (whether it be Roman or not) is "scary" to Prots because they cannot separate the original Christianity from the corrupt political institution it became (and maybe still is). Therefore, ANYTHING Christian that is "catholic" is labeled under the Prot's file folder of "scariness."
(2) Putting Christian imagery all over your walls would overwhelm visiting unbelievers (or visitors from "The Church of Relevancy and God, Inc.") and "push" religion on them. We're not here to push any kind of standard on anyone. We're here to make them comfortable and complacent, remember?
(3) Putting Christian imagery all over the place would shout loud and clear a conformity to a particular tradition and worldview and offend our post-modern (or hyper-modern) aesthetics. We're not here to offend or rock boats, remember? I don't recall Jesus doing anything outlandish, like beating people with a whip, insulting religious leaders, dying as a criminal, or any other paradox invented by G. K. Chesterton.
(4) Putting Christian imagery up is old, therefore it is irrelevant. We're supposed to be relevant, remember? We are to conform to the norm, not live in the past.
-from the desk of the Pastor/Curator/Therapist of the Church of Relevancy and God, Inc.