Heck, a lot of people turn the Bible into an idol. I've heard Protestant preachers have their congregations offer a prayer to the book at the beginning of services.
While I don't discount that you may have heard this, I never have.. ever. My dad is a minister an missionary to Africa. I've been in just about every denomintation of church from Orthodox, Romanist, Protestant "mainline", etc. I've never heard of such a thing. Methinks you're getting propaganda or listening to the red-herring arguments Catholics tend to throw at protestants.
Protestants (mostly) look at the scriptures like we look at the Constitution of the US. It's the founding document. And all else is subbordinate to it. If you make a law and it violates the constitution, the law is then null and void. That is called respecting the authority of the founding. And that is how we check doctrine for veracity as christians. Problem is, as christians, we're not allowed to add to the covenant. Protestants, Catholics and cultists don't seem to so constrain themselves. And that's in large part why you all argue.