
The theological basis of the belief, in its simplest form, is that as God is infallible, the Bible, as the Word of God, must also be free from error. A more nuanced restatement of the same idea is that God inspired the authors of the Bible without marginalizing their personal concerns or personalities, and so preserved the texts from error.
Protestant churches, unlike Eastern and Roman churches, reject that there is an infallible authoritative tradition that is held over scripture. Some Protestants hold that the Bible confirms its own infallibility, pointing out that Jesus frequently quotes Scripture as if it was meant to be taken historically rather than entirely allegorically, and citing John 10:35 "the Scripture cannot be broken," they conclude that if the Bible is not inerrant, then Jesus is a liar.
More...