Bare Walls? I'd like you to visit some grand Lutheran churches (purpose built, not "borrowed") in Lutheran regions of Europe or St.  Paul's cathedral London or Liverpool cathedral (Anglican) or even a stunning Manhattan NY Methodist church. Protestantism is not just Baptist plain or Meeting halls or campus building style evangelical-fundamentalist mega-churches. In fact the Rood Screen, a fixture for centuries in YOUR churches is almost completely gone post-Trent  but lives on in many high church Anglican places.