The Book of Confessions summarizes the statements of faith accepted by the Presbyterian Church (USA). It contains the Apostles' Creed and the Nicene Creed, common to most Christians, six other confessions and three catechisms. A synopsis and history can be found in "Why Do We 'Confess' Our Faith" from Presbyterians Today.
But to understand contemporary Presbyterian faith, consider this third paragraph from "Preface to a Brief Statement of Faith":
"Confessions and declarations are subordinate standards in the church, subject to the authority of Jesus Christ, the Word of God, as the Scriptures bear witness to him. No one type of confession is exclusively valid, no one statement is irreformable. Obedience to Jesus Christ alone identifies the one universal church and supplies the continuity of its tradition. This obedience is the ground of the church’s duty and freedom to reform itself in life and doctrine as new occasions, in God’s providence, may demand." Paragraph 3 from the Confession of 1967, A Brief Statement of Faith.
Jack Rodgers, a former moderator of the General Assembly, has written a more complete exploration of the Book of Confessions. It’s available from Amazon.