Doctrinal statements like this are limited in expressing the fullness of Christian beliefs. The entire Bible really contains our doctrinal statement. In reality, you could have dozens of pages about specific beliefs. This short statement is a good representation of our central beliefs, and our culture.
Simply "knowing" doctrine is not what changes hearts or actions—ours or anyone else’s. Jesus criticized the religious leaders of his day for being hypocrites and legalists. They were very familiar with the Bible and knew a lot of doctrine, but they didn't let that doctrine seep into their hearts or affect their lives as the Scriptures intended. We can know doctrine intellectually but if it doesn't change us on a deeper level the knowledge is almost useless.
What Jesus cares most about is whether or not our lives are being changed by the Spirit as we put saving faith in Him (Romans 10:9), and whether the doctrine we learn expands our love for God and for people (Matthew 22:36-40). That kind of transformation produces in His church (people) the fruit of the Spirit: "love, joy, peace, patience, kindness, goodness, faithfulness, gentleness and self-control." (Galatians 5:22-23)