I’m a little late to the party on this topic, but…
If you are Protestant, why do you accept the 27 books of the New Testament as being canonical?
In the interest of determining which books were actually inspired by the Holy Spirit, hundreds of men put centuries of work into getting it right. They were able to demonstrate that they rejected text that wasn’t inspired and accepted what was. I accept the results because they got it right and they demonstrated that they got it right.
As to the question of whether or not the Holy Spirit protected them from error, I (again) put it in the hands of the people responsible for doing the work. Did they say the Holy Spirit protected them from error? No, they did not, and it was over 500 years before anyone began to suggest that He did. The notion that God protected them from error in this way and that He did so entirely without their knowledge is certainly possible, but it is entirely without precedent and so improbable that I easily dismiss it.
Is it therefore impossible to know with certainty that they did not err, absent the protection of the Holy Spirit? I answer that it was within the realm of possibility for them to err, but we can know with certainty that they did not. Provided that they were able to clearly demonstrate that they did not err. Which they did. (Demonstrate, that is).
Specifically, how did you personally conclude that each of the NT books contained in your Bible are the inspired Word of God and that there are no others that should be included?
I haven’t duplicated the research of the people who initially canonized the NT, it that’s what you mean. But I have looked at their criteria for accepting some and rejecting others. I’ve had the chance to learn some things about the Synoptic Problem, how John fits in with the other Gospels, and the ways in which tradition succeeded and sometimes failed to deliver on the authorship of certain books. I’ve looked at the reasoning that went into some of the books that received serious consideration but were rejected, and I’ve spent some time on Revelation and the reasons it was such a hard sell.
As it turns out, they did good work. Not that I’m surprised. And it’s not really a matter of me giving it a seal of personal approval, as if that means anything. It’s more like I’m an observer of the work they did, and they were able to demonstrate (to me or anyone else) that they acted with good reason and they did a good job.
So that’s why I personally conclude that those 27 books should be included and no others should be included. I looked at the process that some of the books went through (particularly the more controversial ones), and I saw what anyone can see if they look at what happened: They did a good job and arrived at the right canon for the NT.
The Catholic and Greek Orthodox OT canons are a different story. It actually requires the exact same process of evaluation, but it leads to a different conclusion. From what I understand, though, this process of evaluation is rather foreign to Catholics- even for those who are apologists working at CA. I’ve spoken with a couple of them on topics related to this, and it seems like there’s a strong desire to eschew the evaluation process altogether in favor of picking the right people to put your faith in and assuming that they’re always right.
When I pointed out that the Catholics and the Orthodox each have esteemed leaders that demand this kind of faith and that they came up with different OT canons, the CA apologists were unable to tell me anything about what the Catholic people got right that the Orthodox got wrong, and they were unable to tell me anything about a particular book or chapter that the Catholics knew and the Orthodox didn’t. In my experience with Catholic aplogists, it all comes down to putting your faith in the right people. And seriously, it takes at least half an hour to get them to talk about anything else.
I’ve often wondered what it would be like to speak with a pope or some other bishop about what it’s like to be personally or collectively guided by the Holy Spirit to infallible truth that is protected from error. I don’t believe they actually are, but I’m still curious about what kinds of feelings they’d describe. I seriously doubt that I’ll ever have such an opportunity, though.