Jared is fond of wrestling with the question of by what authority is “scripture” declared scripture. It’s a tough question for anyone of any faith and it’s of particular importance to our conversations here.
Greg Koukl of Stand to Reason recently took a couple of consecutive calls on his radio program dealing with this issue. I think he does a good job of presenting the Protestant viewpoint. His basic argument is that the First Century Apostles had authority over the church and their authority extends to their writings collected in the New Testament. If it can be trusted to be authentic writings of the Apostles, then it has authority for us today.
He does a good job of flushing out the issues and I encourage you to listen to what he says in his own words. What I appreciate about his program is that he takes time to give a complete answer (and in this case acknowledges that his answer may not fully satisfy).