[graemep]

It does not have to be that tradition - purely secular history and cultural context will get you a long way.

> consider that the biblical canon was only established at the Council of Rome in 382, which means Christians had existed without a biblical canon for three centuries.

Yes, but the older testament was already well established, and the documents of the new testament were available. The Council made a firm decision of which ones were canon, but they were all documents which were already widely read.

There are other Biblical canons and they do not, in themselves, greatly change the doctrine.

> Compare this with sola scriptura which leads to either incoherence or the demotion of biblical scripture to the level of some stuff some guys wrote that you can read however you want [0].

A lot of protestant churches are prima scriptura, not sola scriptura.