Why God did not preserve any of the original texts, we do not know. The doctrine of Jesus can be found in any version as is implied in that quote. The steps to salvation are clearly stated in several places. It is only a matter of interpretation. There is the story of the little boy who thought God's right hand was completely useless and that God had to do everything with His left hand because he had always heard that Jesus was sitting on the right hand of God.
Christians can make the same error of interpretation with the Bible.
The authors of Understanding the Difficult Words of Jesus and other Biblical scholars, through their research, have tried to help with this problem. A later edition of the text prepared by Erasmus in 1516, the Textus Receptus , which many early translators used, was highly unsatisfactory. A modification had to be made as more manuscript material became available. There are other reputable texts. The potential for error in the New Testament is present.