The Lord Jesus clearly held these men responsible for knowing and understanding the Scriptures. Were the Sadducees supposed to respond, "How could we? We did not think the Bible was clear and we all disagree about what it says!"I agree. So the question becomes why don't we all agree on what Scripture says? Because we don't all want to do what it says.
Who should one trust? Those who attack the Bible in the name of Rome or Jesus? This person says the Bible isn't clear and to think it is is "utter nonsense." Jesus says "have you not read what God said to you" and holds those hearing him responsible for what they read. Think about it.
Beggars All: Reformation And Apologetics: The Utter Nonsense of the Clarity of Scripture?