How do the various denomination defend their specific version as the "One and only word of God"?

The core message of the Bible is clear. Treat others with love and compassion. Help those in need. Why do so many insist on a Bible that is literal, inspired, inerrant, or infallible? The original texts have all been lost. We only have the end result of hundreds of generations of copies, with thousands variations. To claim our current bible comes from God requires a belief in a supernatural influence that goes beyond the original authors. It must also apply to the thousands of copiers over hundreds of years (and many of those copies disagree), the hundreds of clergy who disagreed and ultimately split the church over which books and versions made the cut, and the thousands of translators who have given us over 850 English versions of the Bible. How do the various denomination, in the thousands, defend their specific version as the "One and only word of God"?. Is there a denomination or group that simply says, "Let's just do unto others, and leave it at that?