Are there any oral traditions that haven’t been written and recorded that are still practiced?
That would depend on when your “cut-off” for things being written down is. If you mean things that aren’t in Scripture but are taught/practiced based on the authority of the Apostolic Church you might begin with worshiping on Sunday, the rites of the Sacraments (especially Baptism and Marriage), and, of course, the New Testament.
I ask because the sola scriptura argument comes again. My understanding of the Church is that it holds tradition and scripture on par. Yet church fathers relied on OT scripture, and used what we now call the NT before it was compiled together.
The Early Church Fathers did NOT rely primarily on OT Scripture, they relied on Apostolic Tradition. They accepted the Scriptures (what we call the OT) as the Apostles had done, particularly mining them for typologies of Jesus, and added to them those writings they determined to be of Apostolic origins, what came to be called the New Testament.
Every doctrine I have come across relates back to scripture. What am I missing here? Is it accurate that the Church uses tradition to describe and apply what is in the Bible?
It would be more accurate to say that the Christian Bible is part of the Tradition of the Church. But since it is the teaching of the Church that public revelation ended with the death of the last Apostle (John), nothing new can be added and so all the essentials will indeed trace back to the Scriptures.
Also, when originally compiled, what was the original list of canon? Has it changed?
There were variant compilations used in different parts of the world in the first few centuries of the Church. We have a a number of lists of books that date back to the fourth century (the 300s), the one most generally cited is the canon of the third Synod of Carthage, from 397. At the end of the fifth century Pope Damasus issued a definitive list (known as the
Decretum Gelasianum) of “approved” books (remember that the definition of “canon” was “books that may be read at Mass”) and an appendix of books that were NOT canonical, some of them still worth reading, others flat-out condemned as worthless or even heretical.
In simple fact, one of the strongest arguments against
sola scriptura is the fact that the Church grew and thrived for 400 years without a defined “Bible.” (This is not THE strongest argument, though. The strongest argument against
sola scriptura is that it is not stated in the Scriptures anywhere, so if Scripture is the only source of doctrine, the doctrine of
sola scriptura is . . . unscriptural.)