Can Unbelievers Interpret the Bible?

"The Bible was written under the anointing of the Holy Spirit and thus should be interpreted under the anointing of the Holy Spirit. It's written in such a way that unbelievers won't understand it."

This is a rough quote taken from a comment on YouTube. I heard variations on this theme several times back at my Christian high school. It's a common objection from Christians in response to those who interpret the Bible in ways they're not comfortable with, and I think many of them find it perfectly satisfying. The best way to get them to see the absurdity of this view is probably to use an alternate religion comparison. How would Christians respond to this assertion if it was presented by a Muslim?:

"The Koran was written under the anointing of the Spirit of Allah and thus should be interpreted under the anointing of the Spirit of Allah. It's written in such a way that unbelievers won't understand it."

Now, how would Christians respond? They wouldn't take it seriously for an instant! They would continue to interpret the Koran in the way it made the most sense. And that's all they could do, because the only alternative would be to throw up their hands and say, "Okay, I guess we don't have the authority to judge their holy book." If after considering all the evidence and viewpoints the Koran appears to contain errors and evil, then we must accept that it does, regardless of excuses like the one above. And outsiders to Christianity have the same view of the Bible.

I should also point out that Christians differ tremendously in their various interpretations of scripture. If they were guided by the Holy Spirit, one might expect them to agree on what the Bible means, but instead we see literally tens of thousands of Christian denominations (main ones below) that each have their own view of Christianity. So which of these interpretations is the one that comes from the "anointing of the Holy Spirit"?

Based on the ARC and the fact that Christians can't hope to agree on the right interpretation of Scripture, the idea that the Spirit grants a uniquely correct understanding of it seems a bit silly. Critical scholars are obviously knowledgeable about the Bible and its historical context, and thus should be taken seriously instead of stubbornly dismissed as not having the Holy Spirit. Instead of clinging to this view, Christians should try to honestly compare the religious and secular interpretations of the Bible. Most of them will probably end up reconfirming their existing beliefs, but it's still worth a try.