Br. Rich SFO:
Just the opposite is true. The Creeds were developed to defend teachings combat errors. If a belief was held by all and not challenged or presented in some form of error the Church would have ne reason to defend it.
I would like to say what Br. Rich is saying just a little differently. The Creed is a summary of the teachings of the Church. It was written so that a generally uneducated and illiterate society could have a memorizable summary of the main teachings and give that person some ability to identify hereticical or otherwise confusing teachings.
Now direct to your question. The Creed was written in the 4th century. The Creed says “We believe in one holy catholic and apostolic Church.”
This is a Church that that accepted Peter’s primacy among the Apostles even before Christ’s death, that began saying Mass in the upper room prior to the coming of the Holy Spirit at Pentecost (Masses where they consecrated bread and wine as Jesus taught them and after Pentesost came to understand the Real Presence), that went forth to make disciples for Christ, corrected and admonished those who taught heresy or false teachings and compiled the inspired Word of God into what is now the Bible.
However, note these facts:
Mass was being said and bread and wine consecrated before the writing of the Bible and the Creed.
The Church (subject to the Primacy of Peter) was excercising its exclusive authority to correct and admonish false teachings before the writing of the Bible and Creed.
The Church (subject to the Successor of Peter as Peter had been crucified) determined which Gospels and Letters were the inspired Word of God and which were not to compile the Bible.
And a few hundred years later they compiled the Creed. When they did so, they didn’t need to talk about the Primacy of Peter, the Real Presence, or that the Bible was the inspired Word of God. These are all together and inseparably the foundation to the Creed. Without the foundation, the Creed falls apart.