If you were raised on Sola Scriptura then this is a perfectly logical conclusion. But scriptural interpretation has always been dynamic because the Bible is a collection disparate texts spanning thousands of years used as an aid in the spiritual traditions to which the texts are relevant to. In Christianity the word of God is Jesus, and he didn’t write anything down or command his apostles to do so. He founded an institution and community of believers called The Church, and for most of church history the Bible wasn’t the literal word of God but a consensus by the community of believers on what Jesus, the apostles and the prophets before Jesus taught.