Consider the Nicene Creed. Does it mention Bible? It does say what a Christian in a universal church of the Roman Empire should believe though.
One day I visited a service at a fundamental church and I noticed that a video display interjected the belief in Holy Scriptures into what otherwise looked to me like the Credo I had learned in my own church.
The notion of a credo does not necessarily stay unaltered, I admit. But it is worth investigating when or how belief in every word of the Bible became a pervasive belief among Protestants, especially 2nd Adventists.
When I checked out the video testimony of the former Bethelite who obtained a doctoral degree in chemistry and became a Catholic, I noticed that part of his testimony related to scriptures. He said something that was tantalizing in the beginning, but I don't know if he ever elaborated further on. He said that Scripture was interpreted in the Catholic community as "Christian tradition".
Think about it. That doesn't necessarily mean you chose sides with Samuel against Saul or believe that Joshua's campaign of extermination in Canaan is justified. It's just what we inherit from ages ago in our quest to understand our relation to God and doing what is right by it.
Curiously as well, the same individual cited the writings of Ignatius, Bishop of Antioch. Since he was about second or third in succession and lived in the 1st to 2nd century, that placed an episcopal structure on the church centuries prior to the collection of the Biblical books. Wonder how close he was to making the cut? After all, the competition were people who signed their names as Jude, John, Peter... And people like Barnabas didn't make it. But the decision to include some Hebrew Scriptures and writings of the Apostles came after the Nicene Creed.
So, if the Nicene Creed preceded the canon. Then let's talk about Credos that included any insistence on belief in Scripture: which ones, what verses, what text...Anything.