You said: For bible believing Christians, the word of God is the unique revelation of God to his creatures. What would you have them believe? You would ask them to take the word of man or the world, over the revealed word of God. What kind of a "christian believer" would do that?
The revealed Word of God transcends all and in no way do I propose that any mortal interpretation of Scripture is to be preferred. Our eyes must read the Scriptures, but the Spirit within us reads the Word.
Christ chose twelve very different personalities for His disciples. He could have made them all alike, that fact the He did not is significant.
And the disciples did not all agree on the interpretation of the Law and the Prophets. Acts 15 describes such a dispute and how the negotiation with Peter at Jerusalem helped in the ministry to the Gentiles and how the difference between Paul and Barnabas helped spread the ministry to the Gentiles by their splitting. We see also in Revelation 1-3 where the churches each were accepted and noted for their individual strengths and weaknesses.
My point in all of this is that God permits certain differences which He uses to accomplish His will. If my Christian brother and I disagree on some interpretations of Scripture other than the deity of Christ and the authority of the Word and the Scriptures themselves, the Great Commandment, etc. then I defer to the wisdom of Gamaliel in Acts 5.