Well yes the primary teaching of all Protestant religions since the Reformation has been follow the Bible rather than the tyranny of the Papacy. As with all, or most, Protestant churches the development of a new clergy/laity division has put the enthusiasts of freedom of thought back to square one. A new group of people, priests, bishops, tell the church members what to believe rather than looking to Rome. The original Protestant idea of only look to the Bible and have that Bible in your own language so you can decide what you believe has more or less vanished.
I do like what you say Half banana that all scripture being inspired couldn't have meant just the Bible because the early church didn't have all scripture available to them. That's an interesting thought.
Of course it was a widely held belief in ancient times that poets, writers and artists were inspired by gods and goddesses. As you say inspired utterances could refer to a great many writings on faith.