Well, it's a great society of people (angels also count, I suppose), founded by Christ and still present, which (more precisely, the part still on Earth - those who died saved also belong to the Church, but we don't how many of them there are) currently numbers around 1.3 billion people.
I would think it's obvious that it's a society and not a building, but perhaps I'm misunderstanding you.
First, in case I wasn't sufficiently clear in my previous posts, to avoid any unnecessary misunderstandings (and for others who are reading this), I will try to succintly state my position.
We believe that God already deposited the doctrines of Christianity and isn't going to add anything to them. A portion of this revelation was given to us in the form of a book, namely the Bible; but not all, and some doctrines were given in some other medium: e.g. if the Apostles taught something as infallible dogma to be believed by the faithful, but didn't write it down in the Bible, it would belong to this category.
Sola Scriptura, in its usual meaning, claims that the second of these portions of revelation doesn't exist. One way to show that this is false is by finding at least one piece of revelation contained in this second portion, which I will do in another post below.
If we consider Sola Scriptura as what you seem to mean by it - a practical principle, in which you treat Bible as the only objective source of dogma, even though you accept others might exist - then this also is wrong. If you consider the Bible as the objective, independent from you, deposit of revealed doctrine - then your principle is wrong, because whatever revealed doctrine exist outside the Bible, they too must be abstract truths - absolutely independent from you and objectively true.
But now you might say that you don't know whether, while trying to find this objective, independent, abstract truth you will succeed - that you might be misled on the way, accidentally misinterpret something and think that you have reached this truth, and out of fear that you will in the process come to believe something false, you avoid these and stay only with the Bible.
But the objective, independent truth that the Bible contains is equally "hidden" - you still have to actively study the text to reach it, and in the process you can still be misled, misinterpret something, etc. So such an objection would apply to the Bible too.
Your "helpful simplification" has so far not led you to the Church that is the body of Christ, which God gave the world to save it from Hell.
There is a much easier, more efficient and better way to reach Divine truth: namely, to rely on that which God established as, as 1 Timothy 3:15 says, "the pillar and foundation of truth" - that is, the Church. Surely you can't go wrong with relying on "pillar and foundation of truth", can you?
And since we know (e.g. from His promise in Matthew 16:18) that Jesus will always protect his Church, we can also know that this "pillar and foundation of truth" is still here, still preaching and passing down that truth given to it by Christ, no matter how many false doctrines, invented by men, appear outside in churches founded by men.
Now, if you want to know where this Church of God remains: how many churches can you name which can trace their history back to Christ and his Apostles?
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