I didn't participate in the poll because I am not baptized yet (and as I am an inquirer into the OO, not EO, I'm not sure how well I could answer the question even if I were), but I want to present something...a confession, if you will, for your consideration and understanding of how things can be sometimes for a convert.
Having been raised Protestant in an actively (not just culturally) Christian home, of course I was raised with the idea that the Bible is the self-contained font of all knowledge necessary to live a good Christian life. My mother, who did the raising, was never terribly dogmatic about it or anything, but certainly knew her way around the Bible (always reading it constantly, and writing notes in the margins) and raised me to know it, too. And she would even take me with her to her Bible study at the Presbyterian church, and made sure that when they embarked upon a "Read the Bible in a Year" schedule/project, I would also be reading the entire Bible in that time. It was fun, honestly! I liked it. Got to feel like a grown-up at age 11 or whatever, and learn a lot of things about the Bible.
Fast forward about a dozen years, she had been deceased for about a decade, and I was being received into the Roman Catholic Church. During that time, I learned again about the books of the Bible (especially those that are in common with the Orthodox church that are not found in Protestant Bibles; that was a revelation), what was in them, and how they supported the Roman church's claims.
So here I am now, at nearly 30 years of age, and I feel like I have been taught a lot about the Bible, its contents, and how it supports this or that doctrine of a/the church.
But honestly, I also feel a bit like I am playing a game of "catch-up" with actual Orthodox people (to say nothing of the great Fathers and other saints of the church, whom I would hope we all look up to in this way) in understanding what it all means, rather than simply reading it (as I did when I was a child, with my mother), or "proof"-reading it (as I did when I was Roman Catholic), or doing other things that are befitting it if you approach it from a literalist, or rational, or similar perspective.
I can read the Bible all day, every day (time permitting, of course), but can I understand it as the church has and does? Obviously outside of the church, the answer is no, but even as I approach the church, the answer is maybe still no, or more positively "maybe, but not yet" (or "not by myself"). I mean, I don't even have a proper translation of it yet (just the NAB given to me by the RC, and my mother's old NIV...neither of these are good or faithful translations), to say nothing of the fact that there has been a lack of a suitably Orthodox translation into English until very recently (yes, OO I know have recommended the Orthodox Study Bible, but at the church I go to we use the NKJV, so I hesitate to buy anything without first checking with one of our priests).
I guess my point is that it isn't as simple as the question in the OP, since knowledge of scripture can mean many different things. The devils can probably quote scripture at a level that would rival any Orthodox person...in fact, I know they can, because many people are led astray by anti-Christian heresies presenting themselves as "Biblical". Lord have mercy on us all.