The Authority of the Bible:https://bible.org/seriespage/1-authority-bible People must have a true and authoritative basis for their faith. Many popular religions are based entirely on human ideas and thus are merely theories or philosophies. Christianity is based on the Bible which Christians accept as their final authority because they believe it to be inspired by God. Thus, our first topic for study is the basis for this belief. Why do Christians believe the Bible to be a Book inspired by God? Our answer is found in the Bible itself.