God also gave us nature but we need to study it to understand it. If He tried to give us a book we can understand and failed, what does that say about God's wisdom and power. The problem of different idea about the Bible is with man not God. Our laws were written by wise and able men but ask any two lawyers and you will get two different interpretations. God does not inspire all these interpretations.
Truth is never contradictory.
God has chosen the word method of revelation and all of the problems inherent in this method. There is no need of a revelation if we need an interpretation. He also chose to give this revelation to just a few to whom we must look for information and instruction. The bible gives us example after example of looking to the word for authority. And Ezra the priest brought the law before the congregation both of men and women, and all that could hear with understanding, upon the first day of the seventh month.