>Protestants claim their authority is the Bible but they can never agree upon a universal interpretation of it.
The Bible is the anchor that keeps tradition from straying off course with time, and tradition provides the context in which the Bible is interpreted. Any sufficiently complex text can be interpreted in many ways, but only one way is the right one.
There’s an infinite amount of lines that can be drawn throught a single reference point. You need 2 – i.e both tradition and the written word for the straight and narrow. Like my geometric allegory?
P.S: Modern protestant churches look like supermarkets or office buildings (more often than catholic or orthodox, although I’ve seen abominations among those too). Likewise protestant pastors look like the merchants of the day. In the temple. Looks and symbols are important as much as verbal communication.