"St. Peter"- Peter P. Rubens
This is not a confession of the church but relates to Peter, the Apostler !
Jesus went to the predominately pagan region of Caesarea Philipp. Here is the Mark reading (Mark 8:27-30) ” Jesus went on with his disciples to the villages of Caesarea Philippi; and on the way he asked his disciples, “Who do people say that I am?” And they answered him, “John the Baptist; and others, Elijah; and still others, one of the prophets.” He asked them, “But who do you say that I am?” Peter answered him, “You are the Messiah.” And he sternly ordered them not to tell anyone about him.” Peter nailed it at this time
Jan 18 is the day appointed for this event. The collect – "Almighty Father, who inspired Simon Peter, first among the apostles, to confess Jesus as Messiah and Son of the living God: Keep your Church steadfast upon the rock of this faith, so that in unity and peace we may proclaim the one truth and follow the one Lord, our Savior Jesus Christ; who lives and reigns with you and the Holy Spirit, one God, now and for ever. Amen. "