Why do you think truth is conveyed through multiple genres rather than just one? How do different literary styles shape our understanding of God and His message?
Truth is conveyed through multiple genres to show the creativity of God. These genres help use to better know God and His truths.
God's Word is a double-edged sword. It can make different kids of cuts depending who is weilding the Sword, and which direction is is being used. What speaks to one person and their life situation might not speak as effectively as a different scripture using a different genre. For some the biographical stories are more effective for people to relate to the characters, whereas I, for instance, am deeply moved by the Psalms and Proverbs.
I believe truth is conveyed through multiple genres because it allows us to use all aspects of our minds, which He created, to know Him more.
God uses different genres to reach us in different ways. Stories help us connect and relate to real people and situations. Poetry speaks to our emotions and imagination. Discourse helps us think clearly and understand big truths. Using different styles helps us see more of who God is and how His message applies to every part of life.
The variety of human beings and their differences requires the differences. The complexity of the brain warrants this.
I think it is a way to differentiate between different types of readers. Some genres speak to readers more than others. It allows the Lord to connect with different people in a multitude of ways. It also shows the creativity of the Lord. That He speaks in different ways and through different types of genres, but all ways lead to the overarching story.
The Bible is a collection of books. Most collections of books would naturally include various genres. Specific messages are best conveyed through specific genres. These genres also provide us with a lifetime study and meditation of the Bible in effort to comprehend each genre.