It would be helpful to link to this person so we can read for ourselves his positions.
I don't want this thread to become a jumping point to another person to argue with. I agree with
JohnDB that for those like this guy it's better to have nothing to do with him instead of trying to debate with them to the truth. Hope for him, pray for him and leave it in God's hands. If you still want to see the conversation that I'm referring to for most of this thread, I can PM it to you. But after reading his posts let him be. He seems to be a kind man trying to reach nonbelievers. No point in debating with him.
A couple of thoughts based on your characterization of this person...
1. There was no complete canon of what you call "the Bible" until several centuries after Christ.
I don't know the history behind the bible and how it came to be, but I trust it because I trust God. When searching for God when I was younger I felt like He was pulling me to the bible as I read it. This goes beyond the history of how it's made and agreed on for which books are included, as well as beyond how it's been translated and it's origional languages. I trust the bible as an extension of trusting God. Learning more helps understand it better including the history translations and the languages it was written in, but the source of trust is in God holding it together, not in our methods and actions that have been part of the hustory of the texts in the bible.
2. The two core tenets of the Christian faith, that of the Trinity and the hypostatic union, took centuries to develop and were declared and defined apart from the Scriptures. (They were declared as dogmas at Church councils.)
I never really understood the trinity to the point of saying I agree with it or don't. The points that I seem to be clear on from the bible point to Jesus and God being one, because Jesus said so, as well as instances that show a distinction between Jesus, God, and the Holy Spirit. But in all practice matters if you have God you have Jesus and the Holy Spirit as well. The same is true if you have the Holy Spirit of gave Jesus. It's a package deal regardless if the Trinity is correct or not. Making the doctrine close enough to the truth that it would be indistinguishable from if they are three seperate persons. (At least for us anyways)
3. Scripture itself calls the Church the "pillar and foundation of the truth" (
1 Tim 3:15).
I thought the church was the people. Not the orginization, not the building. I stand by that thought.
4. If left to individual interpretation, there would be tens of millions of versions of the Christian faith. There has to be a final arbiter; an authority; a body or mechanism to declare authoritatively what is or is not the Christian faith.
I call that final arbiter to be the bible. To know if something is truely from the Holy Spirit, or a teaching is really from God I trust the bible to be the test. Does the teaching or the thought contradict what's in the bible? Then it's not from God. If it doesn't contradict what's in the bible, then it's possible that it's God leading that thought or that teaching, or it's possible that it's just our thoughts or our figurings, not God's.
In those instances God is the final arbiter. For all practical matters though the bible is the final arbiter that we can hold to.