I have proven over and again on this blog that the "perfect word of God" is Jesus and the gospel. The fact is that there are many errors in the King James Bible. There are errors in all bibles and the only thing that a theologian would assert is that the original autographs of the biblical books are perfect. The strictest Biblicist would not assert what the bumper sticker asserted. The King James Version is certainly a good version, better than some of the more modern in some ways but most definitely it is not perfect.
You may ask, how can this be the case? If the bible is the story of redemption, and not a legal constitutional document why hasn't the Holy Spirit told this to others? Why are there not more people who believe and teach this? This is a valid question and the answer is that the Holy Spirit has told many people, but some of them are so entrenched in the current evangelical doctrine, in religion when it comes to the scripture, that they are fearful of varying from it. People fear that if they do not see the scripture as a legal constitutional document, and if they don't see it as the word of God that it will somehow be diminished, to that I say hogwash. The fact is this, when one looks at the scripture exactly as Jesus and His first century followers did, it becomes less contradictory, and has much more solidity of message.
The fact is simple, the person that had the bumper sticker on their door as a sign, is actually tearing down the validity of the bible by making erroneous claims that have no basis in fact.