The Bible is the most important text in the Christian religion. The Old Testament details the beginning of the earth and how man got here. It also tells the stories of many prophets and is hundreds of years old. The New Testament is the story of Jesus and his teachings as the son of God.
The New Testament has authority from Jesus Christ. He is the speaker of God and gains authority for his teachings from his connection with God. Christianity asserts that there is only one god and as the son of the only god Jesus has a lot of influence. The Old Testament gains authority from its age and from the large number of people that follows its teachings. The Old Testament is from either the 3rd Century or earlier so it gains authority from the being passed down over 100's of years. Many people also follow the Old Testament, it is even a sacred text for other religions such as Judaism.
Who can interpret the text and why?
The Bible used to only be available to the very wealthy and to religious figures to interpret the text. However, now it is printed so often and in so many different versions that the text can be interpreted by anyone, leading to contrasting ideas about the same text.
"When Jesus gave 5,000 people bread and fish (John 6:1-15), for example, he gave them real bread to satisfy their physical need. Here we are reading literally. But just a few verses later, we are told that Jesus is "the bread of life" (verse 35). Here we must read figuratively: Jesus is the source and sustainer of eternal life.
The real bread that Jesus gave the people had symbolic value. The bread portrayed the important truth that just as Jesus could miraculously create and give the substance of physical life to humans, he could also give them eternal life."
In this example we can see that each individual word can have many meanings making the Bible difficult to interpret. It is also noticeable that there are times in which the Bible should be interpreted literally and times when it should be interpreted metaphorically, meaning there isn't a right or wrong way because there is a balance. This means that the text requires the interpreter to have a decent amount of knowledge about context in order to know when to interpret literally and when to interpret figuratively.
What are the links between sacred texts and key figures?
God and Jesus are the two main figures of Christianity. The Bible is the direct word and teachings of Jesus Christ who spoke the word of God. Thus the Bible comes directly from God through Jesus. The texts are his teachings and his lessons for humanity. Life, death, and resurrection of Jesus are detailed in the Bible, these events are also the proof that Jesus was God's son and teach valuable lessons about the human condition. For example, how we live in sin and the most important Christian belief: that Jesus is the savior.
Had interpretation changed as the religion developed? Sources: https://www.gci.org/bible/literal