I’m guessing you’re among those that are correct.
You neglected to ask whether everyone or anyone has a complete, perfect knowledge of Scripture, the answer to which is no.
I am familiar with the basics, but my knowledge of Scripture is quite limited, actually. I have a long, long way to go.
Almost all of what I know I learned from what amounts to commentary by various scholars. As Scripture says we should, I took every concept presented, with the Scripture proof references, and went back to the Bible, reading the entire chapter of the reference in context, bearing in mind my then current understanding of the whole of Biblical teaching (the rest of Scripture), to see if what the commentary said made sense and did not conflict with anything else. Of course, in the beginning, not knowing basic principles, this was a laborious process, and even now it still is.
I can’t claim any boast on my part.