Just out of curiosity, why do you imply that there is no middle ground between infallible and wrong?
It is outside of the nature of God to be anything less than infallible. Some posts back, I gave a bunch of references that God can't lie and that should be enough to describe the infallibility of God. If anything less than infallibility is exhibited, he's not God. The mark of a divine message is that it is absolute truthfulness. God Himself spoke in the following passage about how he expected nothing but absolute truth from his prophets concerning the message He had given to them or they were put to death.
Deuteronomy 18:18 'I will raise up for them a prophet like you from among their brothers; I will put my words in his mouth, and he will tell them everything I command him. 19 If anyone does not listen to my words that the prophet speaks in my name, I myself will call him to account. 20 But a prophet who presumes to speak in my name anything I have not commanded him to say, or a prophet who speaks in the name of other gods, must be put to death.'